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All of the words	The documents listed will contain each and every word you specify somewhere in the document. Searching for "conference program" will return any documents with BOTH the words "program" AND "conference" somewhere in the text.
Any of the words	The documents listed will contain at lease one of the words you specified. Searching for "conference program" will return any documents with EITHER the word "conference" OR the word "program" in the text.
The exact phrase	The documents listed will contain the exact phrase you entered. E.g., searching for "conference program" will return any documents containing the words "conference program," in that order, but not those with "conference technical program."
NOTE: Extremely common words, such as "are", "as", "a", "the", etc. are ignored in all but "exact phrase" searches.