Perhaps you should try some spelling variations:
"improving overall performance measures." » "improving average performance measures.", "improving governance performance measures.", "improving coverage performance measures.", "improving rural performance measures.", "improving federal performance measures."
"improving thermal performance metrics." » "improving external performance metrics.", "improving animal performance metrics.", "improving erm performance metrics."

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("improving thermal performance metrics.") or ("improving overall performance measures."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving thermal performance metrics.") OR ("improving overall performance measures.")).
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