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 blood performance series." » "improving blood performance studies.", "improving blood performance size.", "improving good performance series.", "improving bond performance series.", "improving floor performance series.", "improving food performance series.", "improving global performance series.", "improving indoor 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 blood performance series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving loan performance review.") OR ("improving blood performance series.")).
• Removing quotes may allow a broader search: (( improving loan performance review. ) or ( improving blood performance series. )).
• Adding a wildcard symbol may retrieve word variants: (("improving loan performance review.") or ("improving blood performance series."))*.