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Exact Phrases

To search for an exact phrase, enclose it in double quotes.  For example:

"natural resources"

Required Search Terms

To indicate a required term, add a '+' symbol before it.  For example:

endangered +turtle
+pollution +"public health"

Excluded Search Terms

To exclude a term from the search results, add a '-' symbol before it.  For example:

nuclear -waste
forests -"timber sales"