Perhaps you should try some spelling variations:
"improving rural performance reviews." » "improving rural performance review.", "improving rural performance reports.", "improving rural performance risks.", "improving pupil performance reviews.", "improving thermal performance reviews.", "improving overall performance reviews.", "improving urban performance reviews.", "improving social performance reviews."
"improving rural performance series." » "improving rural performance metrics.", "improving rural performance review.", "improving rural performance targets.", "improving pupil performance series.", "improving thermal performance series.", "improving overall performance series.", "improving urban performance series.", "improving social performance series."

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("improving rural performance series.") or ("improving rural performance reviews."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving rural performance series.") OR ("improving rural performance reviews.")).
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• Adding a wildcard symbol may retrieve word variants: (("improving rural performance series.") or ("improving rural performance reviews."))*.