Perhaps you should try some spelling variations:
"improving lead performance review." » "improving lead performance risk.", "improving end performance review.", "improving esd performance review.", "improving reward performance review.", "improving legal performance review.", "improving land performance review.", "improving eap performance review."
"improving human performance evidence." » "improving loan performance evidence.", "improving thermal performance evidence.", "improving chain 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 lead performance review.") or ("improving human performance evidence."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving lead performance review.") OR ("improving human performance evidence.")).
• Removing quotes may allow a broader search: (( improving lead performance review. ) or ( improving human performance evidence. )).
• Adding a wildcard symbol may retrieve word variants: (("improving lead performance review.") or ("improving human performance evidence."))*.