Perhaps you should try some spelling variations:
"improving thermal performance metrics." » "improving thermal performance measures.", "improving external performance metrics.", "improving animal performance metrics.", "improving erm performance metrics."
"improving thermal performance review." » "improving thermal performance risk.", "improving thermal performance evidence.", "improving external performance review.", "improving animal performance review.", "improving erm 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 thermal performance review."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"improving thermal performance metrics.\") OR (\"improving thermal performance review.\"))*".
• Removing quotes may allow a broader search: (( improving thermal performance metrics. ) OR ( improving thermal performance review. ))*.