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

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: information documents papers ((((functions ernst) or (functions e.l))) or (functions egfr)) given~.
• If you are trying to use Boolean operators, they must be ALL CAPS: information documents papers ((((functions ernst) OR (functions e.l))) OR (functions egfr)) given.
• Adding a wildcard symbol may retrieve word variants: information documents papers ((((functions ernst) or (functions e.l))) or (functions egfr)) given*.