Perhaps you should try some spelling variations:
"improving social performance contract." » "improving social performance contracts.", "improving school performance contract.", "improving fiscal performance contract.", "improving financial performance contract."
"improving rural performance series." » "improving rural performance studies.", "improving rural performance size.", "improving euract performance series.", "improving larval performance series.", "improving pupil 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 social performance contract."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving rural performance series.") OR ("improving social performance contract.")).
• Removing quotes may allow a broader search: (( improving rural performance series. ) or ( improving social performance contract. )).
• Adding a wildcard symbol may retrieve word variants: (("improving rural performance series.") or ("improving social performance contract."))*.