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