A Boolean system is a way of constructing search queries to retrieve results based on a combination of search terms. The Advanced Search form allows you to construct a search specifying your search terms and their logical relationships using the Boolean operators AND, OR, and NOT. You can enter multiple terms, including or excluding terms as desired using the Boolean operators as follows:

• Term X and Term Y: search results display articles containing both terms
• Term X or Term Y: search results display articles containing either term
• Term X not Term Y: search results display only articles containing Term X, excluding any articles also containing Term Y

For every row of search terms, you can also specify a field to which you can limit your search for those terms.

Multiple terms entered in a single search box are treated as an exact phrase.

Additional tips for constructing a search are available on the Advanced Search Help Page.