Perhaps you should try some spelling variations:
"improving urban performance risks." » "improving bank performance risks.", "improving loan performance risks.", "improving can performance risks.", "improving urban performance risk.", "improving urban performance issues.", "improving urban performance based."
"improving thermal performance evidence." » "improving maternal performance evidence.", "improving rural performance evidence.", "improving human performance evidence."

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 risks.") or ("improving thermal performance evidence."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving urban performance risks.") OR ("improving thermal performance evidence."))*.
• Removing quotes may allow a broader search: (( improving urban performance risks. ) or ( improving thermal performance evidence. ))*.