Perhaps you should try some spelling variations:
"improving human performance evidence." » "improving loan performance evidence.", "improving thermal performance evidence.", "improving company performance evidence.", "improving urban performance evidence."
"improving rural performance based." » "improving pupil performance based.", "improving thermal performance based.", "improving overall performance based.", "improving rural performance measures.", "improving urban performance based.", "improving social performance based."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("improving human performance evidence.") or ("improving rural performance based."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving human performance evidence.") OR ("improving rural performance based.")).
• Removing quotes may allow a broader search: (( improving human performance evidence. ) or ( improving rural performance based. )).
• Adding a wildcard symbol may retrieve word variants: (("improving human performance evidence.") or ("improving rural performance based."))*.