Perhaps you should try some spelling variations:
"improving thermal performance metrics." » "improving thermal performance contracts.", "improving thermal performance measures.", "improving thermal performance contract.", "improving maternal performance metrics.", "improving rural performance metrics.", "improving mental performance metrics."
"improving human performance review." » "improving human performance risk.", "improving human performance evidence.", "improving loan performance review.", "improving company performance review.", "improving animal performance review.", "improving urban performance review.", "improving rural 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 metrics.") or ("improving human performance review."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving thermal performance metrics.") OR ("improving human performance review."))*.
• Removing quotes may allow a broader search: (( improving thermal performance metrics. ) or ( improving human performance review. ))*.