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 social performance review." » "improving school performance review.", "improving fiscal performance review.", "improving financial performance review.", "improving social performance risk.", "improving social performance evidence."

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