Perhaps you should try some spelling variations:
"improving rural performance review." » "improving rural performance risk.", "improving rural performance evidence.", "improving pupil performance review.", "improving overall performance review.", "improving fiscal performance review.", "improving urban performance review.", "improving social performance review."
"improving thermal performance targets." » "improving maternal performance targets.", "improving human performance targets.", "improving mental performance targets."

Try widening your search to All Fields.

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