If you are searching for documents meeting any of several criteria, you need to define the relationship between your search strings using search operators. The following examples assume you are using structured advanced search.
To search for articles meeting a combination of criteria (for example, articles jointly written by M. Delgado and M.A. Vila), select the AND operator to combine items. Your search results will list all articles meeting all criteria you specify. For example:
To search for documents meeting any one of the criteria, select the OR operator to combine items. Your search results will list all documents containing any of the items you specify. For example:
In this example, IEEE Xplore finds documents that contain either the phrase broadband wireless access or the abbreviation BWA in the Abstract field.
If you want to exclude an item from your search, use the NOT operator. Your search results will include those documents that meet the first criteria, but exclude documents that meet the second. For example:
In this example, IEEE Xplore finds documents that contain the phrase acoustic imaging in any field, but not the word water.
Narrowing a Search
Nesting Search Operations