Boolean logic AND, OR, NOT
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e.g. If you type Canada AND election, you will find documents that contain both keywords.
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Quotation marks "____"
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e.g. If you type "human rights" in quotation marks, you will find documents that contain this phrase.
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Truncation *
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e.g. If you type Canad*, you will find documents that contain the words Canada, Canadian, canadienne...
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Wildcard ?
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e.g. If you type wom?n, you will find documents that contain the words woman and/or women.
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Operators may vary from database to database: consult specific database help pages for more information.
Most databases ignore certain common words -- articles, conjunctions and prepositions -- such as the, a, of, for, but...