Perhaps you should try some spelling variations:
"improving thermal performance review." » "improving thermal performance risk.", "improving external performance review.", "improving animal performance review.", "improving erm performance review."
"improving sector performance evidence." » "improve sector performance evidence.", "improving eco performance evidence.", "improving sewer 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 thermal performance review.") or ("improving sector performance evidence."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving thermal performance review.") OR ("improving sector performance evidence."))*.
• Removing quotes may allow a broader search: (( improving thermal performance review. ) or ( improving sector performance evidence. ))*.