Perhaps you should try some spelling variations:
"improving rural performance review." » "improving rural performance risk.", "improving rural performance evidence.", "improving euract performance review.", "improving larval performance review.", "improving pupil performance review."
"improving indoor performance series." » "improving outdoor performance series.", "improving poor performance series.", "improving donor performance series.", "improving indoor performance studies.", "improving indoor performance size.", "improving india's performance series.", "improving food performance series.", "improving gender 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 review.") or ("improving indoor performance series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving rural performance review.") OR ("improving indoor performance series.")).
• Removing quotes may allow a broader search: (( improving rural performance review. ) or ( improving indoor performance series. )).
• Adding a wildcard symbol may retrieve word variants: (("improving rural performance review.") or ("improving indoor performance series."))*.