Perhaps you should try some spelling variations:
"improving urban performance issues." » "improving urban performance measures.", "improving urban performance based.", "improving urban performance size.", "improving bank performance issues.", "improving loan performance issues.", "improving a performance issues."
"improving can performance risk." » "improving can performance size.", "improving can performance based.", "improving can performance _.", "improving bank performance risk.", "improving loan performance risk.", "improving care performance risk.", "improving land performance risk.", "improving tax performance risk.", "improving co performance risk."

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