Perhaps you should try some spelling variations:
"improving overall performance metrics." » "improving average performance metrics.", "improving thermal performance metrics.", "improving governance performance metrics.", "improving coverage performance metrics.", "improving rural performance metrics.", "improving federal performance metrics."
"improving animal performance measures." » "improving annual performance measures.", "improving thermal performance measures.", "improving fiscal performance measures.", "improving initial performance measures.", "improving optimal performance measures.", "improving criminal performance measures."

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