Perhaps you should try some spelling variations:
"improving loan performance review." » "improving loan performance risk.", "improving loan performance evidence.", "improving local performance review.", "improving land performance review.", "improving lead performance review."
"improving mental performance series." » "improving general performance series.", "improving senegal performance series.", "improving annual performance series.", "improving mental performance studies.", "improving mental performance size.", "improving maternal performance series.", "improving fiscal performance series.", "improving gender performance series."

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