Perhaps you should try some spelling variations:
"improving basic performance review." » "improving basic performance risk.", "improving based performance review.", "improving music performance review.", "improving baseline performance review.", "improving air performance review.", "improve basic performance review."
"improving state performance evidence." » "improving trade performance evidence.", "improving care performance evidence.", "improving time performance evidence.", "improving static performance evidence.", "improving staff performance evidence.", "improving stand 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 basic performance review.") or ("improving state performance evidence."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving basic performance review.") OR ("improving state performance evidence.")).
• Removing quotes may allow a broader search: (( improving basic performance review. ) or ( improving state performance evidence. )).
• Adding a wildcard symbol may retrieve word variants: (("improving basic performance review.") or ("improving state performance evidence."))*.