The default operator for searches within a field is AND . A match results only if an article contains each of the terms you enter into a field. You may choose the search operator for searches distributed among more than one field on the Advanced and Expert Search Forms. The default is AND , meaning requirements in each field must be met in order to return a match. The default search operator is configurable for each site.
More experienced searchers can use Boolean search operators.
Use upper-case letters to indicate Boolean search operators . NOT NOT searches for articles containing the query word preceding it, but not the word following it. This is also know as a wildcard search. Stop words are disregarded in phrase searches. ADJ Use the adjacency operator to search for records in which the term that follows it appears immediately after the word preceding it.