Perhaps you should try some spelling variations:
"improving animal performance metrics." » "improving animal performance measures.", "improving annual performance metrics.", "improving fiscal performance metrics.", "improving social performance metrics.", "improving initial performance metrics.", "improving optimal performance metrics.", "improving criminal performance metrics."
"improving thermal performance evidence." » "improving external performance evidence.", "improving erm performance evidence.", "improving federal 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 thermal performance evidence.") or ("improving animal performance metrics."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving thermal performance evidence.") OR ("improving animal performance metrics.")).
• Removing quotes may allow a broader search: (( improving thermal performance evidence. ) or ( improving animal performance metrics. )).
• Adding a wildcard symbol may retrieve word variants: (("improving thermal performance evidence.") or ("improving animal performance metrics."))*.