Perhaps you should try some spelling variations:
"improving urban performance reviews." » "improving urban performance review.", "improving urban performance reports.", "improving urban performance risks.", "improving loan performance reviews.", "improving human performance reviews.", "improving can performance reviews."
"improving bank performance series." » "improving bank performance studies.", "improving bank performance size.", "improving basic performance series.", "improving brain performance series.", "improving air 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 reviews.") or ("improving bank performance series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving urban performance reviews.") OR ("improving bank performance series.")).
• Removing quotes may allow a broader search: (( improving urban performance reviews. ) or ( improving bank performance series. )).
• Adding a wildcard symbol may retrieve word variants: (("improving urban performance reviews.") or ("improving bank performance series."))*.