Perhaps you should try some spelling variations:
"improving urban performance studies." » "improving urban performance audits.", "improving urban performance audit.", "improving urban performance standards.", "improving bank performance studies.", "improving loan performance studies.", "improving can performance studies."
"improving human performance review." » "improving human performance risk.", "improving human performance evidence.", "improving loan performance review.", "improving thermal performance review.", "improving chain performance review."

Try widening your search to All Fields.

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

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