Perhaps you should try some spelling variations:
"improving rural performance series." » "improving rural performance studies.", "improving rural performance size.", "improving euract performance series.", "improving larval performance series.", "improving pupil performance series."
"emerging export performance review." » "emerging export performance risk.", "emerging export performance evidence.", "leveraging export performance review.", "emerging empire performance review.", "emerging empires performance review."

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