Perhaps you should try some spelling variations:
"improving poor performance review." » "improving poor performance risk.", "improving export performance review.", "improving sector performance review.", "improving _ performance review.", "improving power performance review.", "improving food performance review.", "improving indoor performance review."
"improving human performance evidence." » "improving loan performance evidence.", "improving thermal performance evidence.", "improving company performance evidence.", "improving urban performance evidence.", "improving rural performance evidence."

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

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