Perhaps you should try some spelling variations:
"improving overall performance review." » "improving average performance review.", "improving governance performance review.", "improving overall performance risk.", "improving overall performance evidence.", "improving coverage performance review.", "improving rural performance review.", "improving federal performance review."
"improving thermal performance targets." » "improving external performance targets.", "improving animal performance targets.", "improving erm performance targets."

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

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