Perhaps you should try some spelling variations:
"improving external performance reviews." » "improving emotional performance reviews.", "improving materials performance reviews.", "improving sectoral performance reviews.", "improving external performance reports.", "improving external performance risks.", "improving external performance results.", "improving maternal performance reviews.", "improving central performance reviews.", "improving federal performance reviews.", "improving external performance evidences."
"improving thermal performance review." » "improving thermal performance risk.", "improving thermal performance evidence.", "improving animal performance review.", "improving erm performance review.", "improving federal performance review."

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