Note: Capitalize your operators as a matter of practice. In some platforms or search systems, it does not matter whether you enter them in uppercase or lowercase, but others (like Google Scholar) require them to be in uppercase to work properly.
OR
AND
NOT
Use parentheses to set the order of execution of the Boolean logic. Parentheses work in most but not all systems (e.g., they work on the Ovid, PubMed, EBSCOhost, ProQuest, Scopus, and Web of Science platforms, but they are ignored in Google and Google Scholar)
e.g., (chest OR thorax OR thoracic) AND (imaging OR radiographs OR radiography)
Truncation symbols are shortcut characters which can help to include variations of your text word without having to type each variation into the search separately. This feature is also known as stemming. The asterisk is the most common truncation symbol.
Depending on the platform you are using to search a given database (e.g., EBSCOhost, Ovid, ProQuest), other truncation and wildcard symbols may be available to use, for example, within words. Please see the database-specific operators and fields for more information.
* |
Depending on the database or platform, use before (uncommon feature, available in Web of Science and Scopus, for example), within (as a wildcard, depends on database/platform), or at the end of a word root or string (most common option) to replace zero to multiple characters. For more information, please see the search tips (below or within the database/platform help files) on wildcard/truncation options available in commonly used databases or platforms in health sciences e.g. computer* retrieves computer, computers, computerised, computerized, etc. |
The database-specific operators and fields are provided for researchers interested in applying more advanced techniques to their searches.
Advanced search techniques can include quotations to force phrase searching or to turn off lemmatization (this is database-dependent), truncation, wildcards, proximity operators, and specifying search fields (such as title, subject, etc.), Boolean logic, and use of parentheses to force the proper execution of Boolean logic.
Truncation/ Wildcards |
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Phrases/ Parentheses |
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Proximity operators |
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Search fields (examples) |
Default "Select a field (optional)" (i.e., unqualified searching): Searches Title, abstract, subject headings, PubMed IDs (PMIDs), Digital Object Identifiers (DOIs), Authors
Field codes should be capitalized TX: All Text (in CINAHL Plus with Full Text, this field will search full text available in the database, not the full text of every report included in CINAHL) TI: Title e.g., TI ("primary care" OR "primary health care" OR "primary healthcare") AU: Author AF: Author affiliation AB: Abstract e.g., AB ("primary care" OR "primary health care" OR "primary healthcare") PT: Publication type MH: Subject heading MM: Major subject heading MJ: Word in major subject heading or subheading (for subheadings, use two-letter code) MW: Word in subject heading or subheading (for subheadings, use two-letter code) e.g., To search for records containing the free floating subheadings for diagnosis or ultrasound: (MW "DI" OR "US") JN: Publication name (exact) e.g., JN American journal of nursing retrieves the articles published in American journal of nursing PY: Year of publication e.g., PY 2000 retrieves articles published in 2000 SO: Words in publication name e.g., SO art therapy retrieves records published in the International Journal of Art Therapy OR the Journal of the American Art Therapy Association etc. SU: Subject fields (search terms within subject headings fields, including major subject headings or minor subject headings) Multiple search fields: Combine with OR e.g., TI ("primary care" OR "primary health care" OR "primary healthcare") OR AB ("primary care" OR "primary health care" OR "primary healthcare") |
Subject headings |
CINAHL Headings Explode Represented by the + sign at the end of the subject heading: Expands results to include records with the subject heading you originally selected, PLUS all of the narrower subject headings beneath it e.g., (MH "Pregnancy in Diabetes+") will search for records indexed with "Pregnancy in Diabetes" OR "Diabetes Mellitus, Gestational" OR "Fetal Macrosomia" Major concept Represented by MM (instead of MH): Retrieves articles in which indexers consider your topic to be of major significance e.g., (MM "Pregnancy in Diabetes"); can be combined with Explode, e.g., (MM "Pregnancy in Diabetes+") |
To use these operators and fields, go to advanced search > Select search manager tab
Truncation/ Wildcards |
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Phrases/ Parentheses |
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Boolean operators |
AND OR NOT |
Proximity operators |
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Search fields (examples) |
No field specified: Searches all fields, including full text when available (e.g., full text of Cochrane Reviews) :ti Title e.g., screening:ti :ab Abstract :kw Keywords (includes MeSH terms but does not allow for term explosion) :au Author :pt Publication type (used in CENTRAL only) e.g., journal:pt :so Source (title of journal, conference name, report name, etc.) :crg Cochrane Review Group e.g., "Airways":crg Multifield searching: Separate the field tags with commas: :ti,ab,kw |
Subject headings |
MeSH Use the MeSH Tab to search the thesaurus MeSH terms are assigned to Cochrane Reviews and Trials from MEDLINE Note: Not necessary to use MeSH terms if you are already using the same MeSH terms in a MEDLINE search for the same project (e.g., if conducting a systematic review and searching multiple databases) -- they are redundant |
Truncation/ Wildcards |
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Phrase/ Parentheses |
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Proximity and frequency operators |
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Search fields (examples) |
.ab. : Abstract .au. : Author .dj.: Candidate terms are "new concepts which are not in Emtree and were proposed during indexing because they were judged to be a useful addition to Emtree"; this field is searched when using .mp. .in. : Author affiliations. "This information is not standardized and often contains abbreviations. Enter the single most descriptive word in an institution. Consider both full spellings and abbreviations." e.g., prefer mcgill.in. over mcgill university.in. .kf. : Words or phrases in author keyword field .jn. : Exact journal name e.g., "American journal of human biology: the official journal of the Human Biology Council".jn. retrieves article records from the American journal of human biology: the official journal of the Human Biology Council .jx.: Word or phrase in journal name e.g., "american journal of human biology".jn. retrieves article records from the American journal of human biology: the official journal of the Human Biology Council or the American journal of human biology .mp. : "multi-purpose" (database dependent); in Embase, searches ti,ab,hw,tn,ot,dm,mf,dv,kf,fx,dq. .pt. : Publication type e.g., review.pt. .sh. : EMTREE (subject headings in Embase); note: this will not include narrower terms of the subject heading in your search, but does include candidate terms (dj), which are not searched when using mapped subject headings e.g., exp papillomaviridae/ is preferred over papillomaviridae.sh. for comprehensiveness, if you are interested in all forms of papillomaviridae .ti. : Title .ti,ab,kf,dj. : Title (ti) or abstract (ab) or author keyword (kf) or candidate terms (dj) in Embase; alternative to .mp. when trying to avoid subject headings that also contain the terms of interest .tw. : Text word, which is title (ti) or abstract (ab) or drug trade name (tn) in Embase (NOT full text); same as searching .ti,ab,tn. in Embase .yr. : Year of publication |
Subject headings |
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Truncation/ Wildcards |
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Phrase/ Parentheses |
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Proximity operators |
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Search fields (examples) |
Default "Select a field (optional)": Title, Author, Subjects (Descriptors/Identifiers), Institution Name, Core Subjects, and the Abstract Summary TX: All Text, searches all of ERIC's searchable fields TI: Title AU: Author AB: Abstract DE: Subject headings/descriptors (phrase indexed) searches exact subject heading descriptors EM: Entry date in the format CCYY KW: Keywords or identifiers, performs a keyword search for terms describing the article JN: Journal name, searches exact journal name LA: Language PY: Year of Publication SU: Subject headings/descriptors (word indexed), searches subject headings that briefly describe the item's content |
Subject headings |
ERIC Thesaurus; use Thesaurus link in top left-hand corner to find descriptors and to include narrower terms (via Explode) |
Truncation/ Wildcards |
$ or *: Used at the end of the stem of a word e.g., epidemiolog$ retrieves epidemiologic, epidemiological, epidemiologist, epidemiologists, epidemiology Note: Truncation does not work in quoted phrases |
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Lemmatization | Appears to be unavailable |
Phrase/ Parenthesis |
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Proximity operators |
Appear to be unavailable; use AND or phrase searching instead |
Search fields (examples) |
TW: Title words, abstract words, subject descriptors e.g., tw:tuberculosis TI: Title words e.g., ti:tuberculosis MH: MeSH / DeCS subject descriptors MJ: Major MeSH / DeCS subject descriptors SH: Qualifiers such as the subheadings in MEDLINE e.g., SH:"prevention & control" PT: MeSH / DeCS descriptors of the publication type e.g., pt:review entry_date: Date the document was registered in the database e.g., entry_date:202006*
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Subject headings |
MeSH / DeCS descriptors (controlled trilingual vocabulary consisting of English, Portuguese, and Spanish) Note: Use is particularly helpful if you are not translating your textwords/keywords to other languages; searched also via "tw:" code (see above) |
Truncation/ Wildcards |
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Phrase/ Parentheses |
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Proximity and frequency operators |
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Search fields (examples) |
.ab. : Abstract .au. : Author .cl. : Collection .in. : Institution .kf. : Words or phrases in author keyword field .jn. : Journal name e.g., American journal of human biology.jn. retrieves article records from the American Journal of Human Biology .mp. : "multi-purpose" (database dependent); in MEDLINE, searches ti,ab,ot,nm,hw,fx,kf,ox,px,rx,ui,sy. .pt. : Publication type .sh. : MeSH (subject headings in MEDLINE); note: it is preferred to use subject heading mapping to take advantage of exploding a subject heading to include narrower terms .so. : Source .ti. : Title .ti,ab,kf. : Title or abstract or author keyword IN MEDLINE .tw. : Text word, which is usually title or abstract (NOT full text) .yr. : Year of publication |
Subject headings |
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Truncation/ Wildcards |
* At the end or inside a string retrieves variations of a search term (replaces up to 5 characters if otherwise unspecified) [*n] is used to denote how many characters you want to truncate e.g., computer* retrieves computer, computers, computerised, etc., but not computerization (need to search computer[*7] for the latter to be picked up); colo*r retrieves color, colour, colocator e.g., econom[*2] retrieves economy or economic, but not economies ? Use to replace 0 or 1 character, either inside or at the end of a word e.g., nurse? retrieves nurse or nursed or nurses but not nursery ?? (or ???...) Use to replace 0 or 1 or 2 (or 3...) characters, either inside or at the end of a word Avoid too many truncated terms in a search: Reports that up to 10 truncation symbols in a search is okay, but over may not work |
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Lemmatization | Used by default; to turn off automatic searching for spelling variants and lemmatiziation, use " " |
Phrase/ Parentheses |
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Proximity operators |
NEAR/n Retrieves records that contain your terms (in any order) within a specified number (n) of words of each other. Defaults to a maximum of four words between your terms. e.g. biologist NEAR/5 relationship retrieves records that contain the words biologist and relationship within five words of each other in either direction.
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Some search fields are database dependent To search anywhere in the record, do not specify a search field. e.g., (tornado* OR hurricane* OR "natural disaster*")
Advanced search > Command Line:
NOFT: Anywhere except full text e.g., NOFT("physical therapy")
ADV: Advisor - available in ProQuest Dissertations and Theses Global AUTHOR: Author ABSTRACT: Abstract e.g., ABSTRACT("physical therapy") FULLTEXT: Searches for terms in body of the article (note: full text is not necessarily available in ProQuest databases) LA: Language e.g., LA(french) PUBLICATION: Publication title e.g., PUBLICATION(wall street journal) SCH: School name/code - available in ProQuest Dissertations and Theses Global SUBJECT: Subjects (all) TITLE: Document title Search across multiple fields in Advanced search > Command Line: e.g., ABSTRACT,SUBJECT,TITLE("physical therapy") e.g., SUBJECT,TITLE("physical therapy") or SUBJECT,TITLE("physical therapy")
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Subject headings |
Database dependent |
Note: Long search strings and strategies > 10 lines may crash
Truncation/ Wildcards |
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Phrase/ Parentheses |
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Proximity and frequency operators |
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Search fields (examples) |
.ab. : Abstract .au. : Author .id. : Key concepts; used to supplement subject headings .in. : Institution .jn. : Journal name (full name of the journal) e.g., American journal of human biology.jn. retrieves article records from the American Journal of Human Biology .jw. : Journal word; retrieves all journals including that word in their name .mp. : "multi-purpose" (database dependent); in APA PsycINFO, searches ti,ab,hw,tc,id,ot,tm,mh .pt. : Publication type (also available as limits in APA PsycINFO) .sh. : Searches exact subject headings from the Thesaurus of Psychological Index Terms; note: it is preferred to use subject heading mapping to take advantage of exploding a subject heading to include narrower terms (see more on subject headings below) .so. : Source; "includes a display of all the basic information needed to locate a citation" .ti. : Title .ti,ab,id. : Title or abstract or key concepts in APA PsycINFO .tw. : Title or abstract or table of contents or key concepts in APA PsycINFO (ti,ab,id,tc) .yr. : Year of publication |
Subject headings |
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Truncation/ Wildcards |
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Lemmatization | When automatic term mapping is on, lemmatization is applied using tools including the Specialist Lexicon from UMLS |
Phrases/ Parentheses |
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Proximity |
Search syntax: "Phrasal terms"[Title:~N] where N = maximum number of words appearing between the terms as entered Available for [Title] / [ti] or [Title/Abstract] / [tiab] searches Terms for proximity searching must be enclosed in quotations Turns off automatic term mapping for the terms being searched using proximity Boolean words and stopwords within the quoted phrase for proximity searching are treated as search terms Search terms cannot be truncated: Truncation will turn off proximity searching e.g., "juvenile diabetes"[Title:~3] e.g., "patient physician relationship"[tiab:~0] OR "patient physician relationships"[tiab:~0] Note: [tiab:~0] seems useful for finding phrases not included in the PubMed phrase index |
Search fields (examples) |
Search field codes can be in upper- or lower-case (Boolean operators must be in upper-case) [mh] or [Mesh] or [MeSH Terms]: MeSH term. Includes narrower terms by default in PubMed e.g., "ultrasonography"[mesh] [majr] or [MeSH Major Topic]: MeSH Major Topic (indicated in the list of MeSH terms assigned to a record with an * at the end of the term) e.g., "ultrasonography"[majr] [mesh:noexp]: MeSH term excluding narrower terms [majr:noexp]: MeSH major topic excluding narrower terms [subheading] or [sh]: Subheading, including narrower subheadings Can be attached to a MeSH term (availability depends on the MeSH term) or, as listed here, searched as a "floating subheading" e.g., "diagnosis"[subheading] (versus, e.g., "tuberculosis/diagnosis"[mesh]) [jt]: Full journal title (Note: Use [all] if looking for individual words in the journal title field) [tiab] or [Title/Abstract]: Title or abstract or author keywords [tw] or [Text Word]: Title or abstract or author keywords or entry terms (Note: PubMed does not search full text) [ti] or [Title]: Title [ot] or [Other Term]: Author keywords [all] or [All Fields]: All fields available in the record, including author name words, journal words, affiliation [au] or [Author]: Author field e.g., Pai M[au] retrieves records listing authors with the first initial M plus other initials following it, and last name Pai [pdat]: Publication year [pt]: Publication type e.g., "randomized controlled trial"[pt] |
Subject headings |
MeSH terms Use quotes around MeSH terms to enforce their exact use
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Truncation/ Wildcards |
Wildcards can be used anywhere in the word, even at the beginning Note: Truncation does not disable lemmatization * Represents any number of characters, even 0 e.g., computer* retrieves computer OR computers OR computerised OR computerized etc. ? Represents any single character e.g., wom?n retrieves woman OR women |
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Lemmatization | Used by default; searching using lemmatization and equivalents can be turned off with curly brackets { } |
Phrase/ Parentheses |
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Proximity operators |
PRE/n Preceded by n Retrieves articles that contains your words, in your given order, within a specified number (n) of words of each other e.g. primary PRE/1 *care finds articles in which primary precedes care (or, as also relevant, healthcare) by one or fewer words
W/n Within n Replaces the n with a number to specify the maximum number of words that separate the terms. e.g., parent* W/5 relationship* finds articles in which parent and relationship are no more than 5 words apart |
Search fields (examples) |
NO FIELD specified: () = A search of the entire record, including the list of references AFFIL() = Affiliation fields, including AFFILCITY OR AFFILCOUNTRY OR AFFILORG ALL() = Searches full record (ABS, AFFIL, ARTNUM, AUTH, AUTHCOLLAB, CHEM, CODEN, CONF, DOI, EDITOR, ISBN, ISSN, ISSUE, KEY, LANGUAGE, MANUFACTURER, PUBLISHER, PUBYEAR, REF, SEQBANK, SEQNUMBER, SRCTITLE, VOLUME, and TITLE) AUTH () = Author fields, including AUTHLASTNAME OR AUTHFIRST PUBYEAR = Publication Year e.g., PUBYEAR > 2009 searches references published in 2010 or later; PUBYEAR < 2011 searches references published in 2010 or earlier; PUBYEAR = 2010 searches references published in 2010 SRCTITLE () = Source title e.g., SRCTITLE(adolescen*) will retrieve records published in Child and Adolescent Psychiatry and Mental Health, Journal of the American Academy of Child and Adolescent Psychiatry, Journal of Adolescent Research, etc. TITLE () = Title e.g., TITLE(Therapy) retrieves records in which therapy (or synonyms, based on system's synonym finder, aka lemmatization dictionary) is in the title TITLE-ABS-KEY() = Title OR Abstract OR Keywords - searches Title OR Abstract OR Keywords, which includes Author Keywords (AUTHKEY) OR Indexing Terms (INDEXTERMS) OR Trade Names (TRADENAME) OR Chemical Names (CHEMNAME) |
Subject headings |
Contained in the INDEXTERMS fields; subject headings do not "explode" (narrower subject headings are not included unless they are explicitly listed in the search) Includes index terms (subject headings) from the following thesauri:
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Truncation/ Wildcards |
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Lemmatization |
Used by default in topic (TS) and title (TI) field searches; lemmatization and stemming are not applied automatically in these fields when search terms contain wildcards Quotations turn off lemmatization |
Phrases/ Parentheses |
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Boolean operators |
AND OR NOT Boolean operators in organizational names: Enclose in quotations e.g., "Near" East Univ e.g., "Japan Science and Technology Agency (JST)" Case of Boolean operators (e.g., AND versus and) does not matter when using search operators in Web of Science |
Proximity operators |
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Search fields (examples) |
TI= Title (lemmatization is turned off in this field by using quotes or exact search) e.g., TI=(Therapy) retrieves records in which therapy (or related terms based on lemmatization and spelling variants) is in the title TS = Topic - searches Title, Abstract, Author Keywords, and Keywords Plus (lemmatization is turned off in this field by using quotes or exact search) ALL = All fields (lemmatization can be turned off in this field by using quotes or exact search) AB = Abstract (lemmatization is not turned off in this field by using quotes or exact search) AK = Author keywords (lemmatization is turned off in this field by using quotes or exact search) KP = Keywords Plus (lemmatization is turned off in this field by using quotes or exact search) AD = Address (more information) AU = Author (more information) PY = Year Published |
Subject headings |
Not available |
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