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