Boolean operators, AND, OR, NOT , are yet another way of taking control of search results. Using AND instructs the search tool to look for documents containing both words. Using OR instructs the search tool to look for documents that contain one term or the other, or both. Using NOT instructs the search tool to look for documents containing one of the search terms but not the other. Not all search engines support Boolean operators.
Some search engines allow the use of a wildcard.
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