Advanced use A space between keywords has the effect of an 'and' operator, and will produce results containing all the supplied keywords. The operator 'OR' between two keywords will match one or both keywords. Parentheses may be used for more complex searches. The search will attempt to match all standard variants of a word (plurals, gerunds, etc). Double quotation marks around an expression will perform an exact search for that expression. All searches are case insensitive. Examples:
change blindness will match documents containing both 'change' and 'blindness'.
change or blindness will match documents containing either 'change' or 'blindness' (or variants such as 'blind').
(change or colour) blindness will match documents containing either 'change' and 'blindness', or 'colour' and 'blindness'.
"change blindness" (ie within double quotes) will match only the string 'change blindness'.
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