Perhaps you should try some spelling variations:
"improving thermal performance measures." » "improving maternal performance measures.", "improving rural performance measures.", "improving mental 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."

Try widening your search to All Fields.

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

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