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 pupil performance targets." » "improving social performance targets.", "improving model performance targets.", "improving judicial performance targets.", "improving public performance targets.", "improving civil performance targets.", "improving audit performance targets."

Try widening your search to All Fields.

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