Perhaps you should try some spelling variations:
"improving rural performance series." » "improving rural performance metrics.", "improving rural performance reviews.", "improving rural performance review.", "improving pupil performance series.", "improving thermal performance series.", "improving overall performance series.", "improving urban performance series."
"improving social performance issues." » "improving school performance issues.", "improving fiscal performance issues.", "improving financial performance issues.", "improving social performance measures.", "improving social performance based.", "improving social performance size."

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