Perhaps you should try some spelling variations:
"improving rural performance series." » "improving rural performance metrics.", "improving rural performance reviews.", "improving rural performance review.", "improving thermal performance series.", "improving overall performance series.", "improving fiscal performance series.", "improving urban performance series.", "improving social performance series."
"improving pupil performance contracts." » "improving social performance contracts.", "improving fund performance contracts.", "improving judicial performance contracts.", "improving public performance contracts.", "improving supply performance contracts.", "improving civil performance contracts."

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