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

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("improving urban performance review.") or ("improving human performance studies."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving urban performance review.") OR ("improving human performance studies.")).
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