Controlled vocabulary codes are unique to a database.

• MeSH for PubMed
• MH for CINAHL
• SU.EXACT for PsycINFO

These search strategies are on the same topic, but each search is unique to the database.

• PubMed - "Spouse Abuse"[Mesh] AND "Self-Help Groups"[Mesh]
• CINAHL - (MH "Intimate Partner Violence") AND (MH "Support Groups")
• PsychINFO - SU.EXACT("Partner Abuse") AND SU.EXACT("Support Groups")

Most Races have a controlled vocabulary term, but they are not always the same term

• PubMed - "African Americans"[Mesh]
• CINAHL - (MH "Blacks")

Not every word has a controlled vocabulary term. If you cannot find a matching controlled vocabulary term search the concept as keywords placing phrases inbetween quotation marks.

• “end-tidal carbon dioxide”