Perhaps you should try some spelling variations:
"improving based performance based." » "improving based performance measures.", "improving care performance based.", "improving board performance based.", "improving past performance based.", "improving basic performance based.", "improving shared performance based.", "improving water performance based."
"improving bank performance _." » "improving market performance _.", "improving _ performance _.", "improving firm performance _.", "improving land performance _.", "improving urban performance _.", "improving basic performance _."

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

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