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Try using the Boolean operators "AND, OR, NOT." Boolean operators are commands which affect the results returned in a search; they are always all-caps. Use the word "AND" between terms to retrieve records that contain both terms. Using "AND" narrows your search. Use the word "OR" between terms to retrieve records that contain either term. Using "OR" broadens your search. Use the word "NOT" between terms to retrieve records that contain the first term but not the second term. Using "NOT" narrows your search.
Examples:
pakistan AND history = retrieves records that contain both terms
canines OR dogs = retrieves records that contain either term
trees NOT evergreen = retrieves records that contain the word trees, but not the word evergreen
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