This page contains enriched content visible when JavaScript is enabled or by clicking here. Skip to main content
It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.

Searching tips & tricks: Boolean Connections

Boolean logic with venn diagrams of AND, OR, NOT

AND

AND tells the computer to return only results with both of the terms entered

Example:

  • Cats AND Dogs

This would only show you articles or books that have both words.  It would not show you results that have only one of the terms.

AND makes your results set smaller, but more specific.

OR

OR tells the search engine that you want results with either of a pair of terms.  It does not require that both terms are present. Try to use OR with synonyms or words with similar enough meanings that they are interchangeable.

Example:

  • gasoline OR petrol
  • cost OR price

OR makes your results set larger.

NOT

NOT allows you to exclude a term that is irrelevant to your search.

Example:

  • Saturn NOT Planet (want the automobile, not astronomy)

NOT can be tricky, but it makes your results list smaller and more specific by eliminating what you don't want. If you repeatedly retrieve unrelated articles, you might look for a term that you can use NOT with to exclude them from later searches.