Perhaps you should try some spelling variations:
"improving urban performance review." » "improving urban performance risk.", "improving urban performance evidence.", "improving bank performance review.", "improving loan performance review.", "improving can performance review."
"improving thermal performance series." » "improving thermal performance metrics.", "improving thermal performance reviews.", "improving thermal performance targets.", "improving maternal performance series.", "improving rural performance series.", "improving human performance series."

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