Once you find your keywords, you then have to indicate the relationship between the keywords using Boolean operators AND, OR, or NOT.
AND
![](http://lgimages.s3.amazonaws.com/data/imagemanager/16324/booland-small.jpg)
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- AND finds results that contain all of the keywords
- AND finds less results and helps narrow your search
- Example Search: Strawberry AND Vanilla AND Chocolate will find results that contain all three flavors
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OR
![](http://lgimages.s3.amazonaws.com/data/imagemanager/16324/boolor-small.jpg)
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- OR finds results that contain at least one of the keywords (but not necessarily all)
- OR finds more results and helps broaden your search (when you are not finding enough)
- Example Search: Strawberry OR Chocolate OR Vanilla will find results that contain at least one of those flavors
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NOT
![not](http://lgimages.s3.amazonaws.com/data/imagemanager/16324/boolnot-small.jpg)
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- NOT excludes keywords from the results
- NOT narrows your search but should be used cautiously to avoid accidental exclusions
- Example Search: (Strawberry OR Vanilla) NOT Chocolate will find results Strawberry and/or Vanilla but excludes any results that mention Chocolate
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(adapted from content created by Helen Hooper, Sharon Bryan, and Kylie Bartlett of James Cook University -- Writing Guide)