Perhaps you should try some spelling variations:
"improving rural performance review." » "improving rural performance risk.", "improving euract performance review.", "improving pupil performance review.", "improving human performance review."
"improving larval performance evidence." » "improving level performance evidence.", "improving thermal performance evidence.", "improving maximal performance evidence.", "improving local performance evidence.", "improving legal performance evidence.", "improving land performance evidence."

Try widening your search to All Fields.

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