Perhaps you should try some spelling variations:
"improving bank performance review." » "improving bank performance risk.", "improving bank performance evidence.", "improving market performance review.", "improving _ performance review.", "improving firm performance review.", "improving land performance review.", "improving urban performance review.", "improving basic performance review."
"improving social performance based." » "improving school performance based.", "improving fiscal performance based.", "improving financial performance based.", "improving social performance measures."

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 review.") or ("improving social performance based."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving bank performance review.") OR ("improving social performance based.")).
• Removing quotes may allow a broader search: (( improving bank performance review. ) or ( improving social performance based. )).
• Adding a wildcard symbol may retrieve word variants: (("improving bank performance review.") or ("improving social performance based."))*.