Perhaps you should try some spelling variations:
"improve company performance reviews." » "improve country performance reviews.", "improve company performance reports.", "improve company performance risks.", "improve company performance results.", "improve company performance evidences."
"improving thermal performance review." » "improving thermal performance risk.", "improving thermal performance evidence.", "improving external performance review.", "improving animal performance review.", "improving erm performance review."

Try widening your search to All Fields.

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 ("improve company performance reviews."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving thermal performance review.") OR ("improve company performance reviews.")).
• Removing quotes may allow a broader search: (( improving thermal performance review. ) or ( improve company performance reviews. )).
• Adding a wildcard symbol may retrieve word variants: (("improving thermal performance review.") or ("improve company performance reviews."))*.