Search expressions and Search operators

You may combine two or more search terms in a search expression by using search operators, which indicate the intended relationship between the terms. In formulating your search expression you may use two types of terms: precise terms, right truncated terms. There are three basic operators: OR, AND, and NOT that are schematically represented, where each box represents the records indexed, with the indicated and the coloured area representing the set of records that would result by applying the various operators. 

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