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

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