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 food performance series." » "improving food performance studies.", "improving food performance size.", "improving good performance series.", "improving fund performance series.", "improving bond 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 food performance series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving urban performance review.") OR ("improving food performance series.")).
• Removing quotes may allow a broader search: (( improving urban performance review. ) or ( improving food performance series. )).
• Adding a wildcard symbol may retrieve word variants: (("improving urban performance review.") or ("improving food performance series."))*.