Perhaps you should try some spelling variations:
"improving urban performance issues." » "improving urban performance index.", "improving bank performance issues.", "improving loan performance issues.", "improving human performance issues."
"improving can performance measures." » "improving chain performance measures.", "improving loan performance measures.", "improving human performance measures.", "improving care performance measures.", "improving a performance measures.", "improving co performance measures."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("improving can performance measures.") or ("improving urban performance issues."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving can performance measures.") OR ("improving urban performance issues.")).
• Removing quotes may allow a broader search: (( improving can performance measures. ) or ( improving urban performance issues. )).
• Adding a wildcard symbol may retrieve word variants: (("improving can performance measures.") or ("improving urban performance issues."))*.