Perhaps you should try some spelling variations:
"improving urban performance review." » "improving urban performance risk.", "improving urban performance evidence.", "improving bank performance review.", "improving loan performance review.", "improving human performance review."
"improving pupil performance series." » "improving pupil performance studies.", "improving pupil performance size.", "improving social performance series.", "improving model performance series.", "improving judicial performance series.", "improving public performance series.", "improving civil performance series.", "improving audit 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 urban performance review.") OR ("improving pupil performance series."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"improving urban performance review.\") OR (\"improving pupil performance series.\"))".
• Removing quotes may allow a broader search: (( improving urban performance review. ) OR ( improving pupil performance series. )).
• Adding a wildcard symbol may retrieve word variants: (("improving urban performance review.") OR ("improving pupil performance series."))*.