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