Perhaps you should try some spelling variations:
"improving urban performance series." » "improving urban performance metrics.", "improving urban performance reviews.", "improving urban performance review.", "improving bank performance series.", "improving loan performance series.", "improving can performance series."
"improving sharia performance based." » "improving sharia performances based.", "improving thermal performance based.", "improving care performance based.", "improving sharia performance measures.", "improving shared performance based.", "improving social performance based."

Try widening your search to All Fields.

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