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