Perhaps you should try some spelling variations:
"improving based performance based." » "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 measures." » "improving market performance measures.", "improving _ performance measures.", "improving firm performance measures.", "improving land performance measures.", "improving urban performance measures.", "improving basic performance measures."

Try widening your search to All Fields.

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