Perhaps you should try some spelling variations:
"improving thermal performance based." » "improving maternal performance based.", "improving rural performance based.", "improving mental performance based.", "improving thermal performance measures."
"improving human performance evidence." » "improving loan performance evidence.", "improving company performance evidence.", "improving animal 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 thermal performance based."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving human performance evidence.") OR ("improving thermal performance based.")).
• Removing quotes may allow a broader search: (( improving human performance evidence. ) or ( improving thermal performance based. )).
• Adding a wildcard symbol may retrieve word variants: (("improving human performance evidence.") or ("improving thermal performance based."))*.