Perhaps you should try some spelling variations:
"improving thermal performance metrics." » "improving thermal performance contracts.", "improving thermal performance contract.", "improving maternal performance metrics.", "improving human performance metrics.", "improving mental performance metrics."
"improving rural performance measures." » "improving pupil performance measures.", "improving overall performance measures.", "improving fiscal performance measures.", "improving urban performance measures.", "improving social performance measures."

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