Perhaps you should try some spelling variations:
information documents » information documentation, information agents, information requirements
documents papers » documents posters, documents divers, documents power
functions second » function second, functions beyond, functions seafood
functions egfr » functions error, functions euler, functions e
functions esf » functions e, functions e.l, functions ernst

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• Performing a fuzzy search may retrieve terms with similar spellings: information documents papers ((functions esf) or (((functions second) or (functions egfr)))) lines~.
• If you are trying to use Boolean operators, they must be ALL CAPS: information documents papers ((functions esf) OR (((functions second) OR (functions egfr)))) lines.
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