Here are some ways to use keywords in a more complex search: 

 - By using the word AND to combine keywords databases will yield a narrower and more specific set of results, since AND tells the database to retrieve articles that have both keywords in them.

- By using the word OR to combine keywords databases will yield a broader and more comprehensive set of results, since OR tells the database to retrieve articles that have either one of the keywords in them (rather than both).

Examples:

• Anxiety OR Anxiety Disorders: This search will yield articles that discuss either anxiety or anxiety disorders.

• Panic Attacks AND Social Anxiety Disorder: This search will yield articles that discuss both panic attacks and social anxiety disorder in the same article.

• Anxiety AND Women: This search will yield articles that discuss both anxiety and women in the same article.

• OCD OR Obsessive Compulsive Disorder AND Children: This search will yield articles that discuss either OCD and children in the same article or obsessive compulsive disorder and children in the same article (it is sometimes helpful to search concepts both by their acronyms and full names in case articles only refer to the concept in one particular way).