Search for exact phrases using quotation marks -

"Cyrus the Great"

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Use AND to narrow search to include both terms - 

"Cyrus the Great" AND Democracy

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Use OR to expand search to include either search term (synonyms) -

Human Rights OR Natural Rights

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Use brackets to combine AND & OR rules -

"Cyrus the Great" AND (Human Rights OR Democracy)

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Use site: to narrow your search

human rights site:https://www.un.org

site:edu