Perhaps you should try some spelling variations:
"improving urban performance series." » "improving urban performance studies.", "improving urban performance size.", "improving bank performance series.", "improving loan performance series.", "improving human performance series."
"improving macro performance review." » "improving macro performance risk.", "improving macro performance evidence.", "improving crop performance review.", "improving ceo performance review.", "improving machine performance review.", "improving air performance review.", "improving care performance review.", "improving co 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 urban performance series.") or ("improving macro performance review."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving urban performance series.") OR ("improving macro performance review.")).
• Removing quotes may allow a broader search: (( improving urban performance series. ) or ( improving macro performance review. )).
• Adding a wildcard symbol may retrieve word variants: (("improving urban performance series.") or ("improving macro performance review."))*.