Perhaps you should try some spelling variations:
"improving poor performance review." » "improving poor performance risk.", "improving poor performance evidence.", "improving export performance review.", "improving sector performance review.", "improving _ performance review.", "improving power performance review.", "improving food performance review.", "improving indoor performance review."
"improving rural performance series." » "improving rural performance metrics.", "improving rural performance reviews.", "improving rural performance targets.", "improving pupil performance series.", "improving thermal performance series.", "improving overall performance series.", "improving urban performance series.", "improving social performance series."

You may be able to get more results by adjusting your search query.

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