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 risks." » "improving external performance risks.", "improving animal performance risks.", "improving erm performance risks.", "improving thermal performance risk."

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

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