Perhaps you should try some spelling variations:
information requirements » nutrition requirements, irrigation requirements, information environments
requirements patents » requirements patterns, requirements papers, requirements water
functions event » auctions event, functions segments, functions prudent
functions egfr » functions esf, functions error, functions euler

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

• If you are trying to use Boolean operators, they must be ALL CAPS: information requirements patents ((functions event) OR (functions egfr)) lines~.
• Adding a wildcard symbol may retrieve word variants: information requirements patents ((functions event) or (functions egfr)) lines*.