Perhaps you should try some spelling variations:
"improving social performance reviews." » "improving social performance review.", "improving social performance reports.", "improving social performance risks.", "improving school performance reviews.", "improving fiscal performance reviews.", "improving financial performance reviews."
"improving pupil performance series." » "improving pupil performance studies.", "improving pupil performance size.", "improving model performance series.", "improving judicial performance series.", "improving public performance series.", "improving civil performance series.", "improving audit performance series."

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