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Ovid - Advanced searching in Medline: Combining using AND or OR

Ovid - Advanced searching in Medline, Wellington Medical & Health Sciences Library, University of Otago.

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Combining your search terms using AND or OR

Once you have your set of subject headings and keywords combine them to get your final result.

Checkboxes, AND and OR buttons highlighted in search history.

Select the sets you want to combine by checking the checkboxes next to each set of results and choosing AND or OR.

  • OR gathers together search terms that are synonyms, or alternative terms (either subject headings or keywords).
  • AND finds the overlap between the subject headings or keywords.


Boolean operators

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