Perhaps you should try some spelling variations:
"improving coverage performance based." » "improving average performance based.", "improving overall performance based.", "improving governance performance based.", "improved coverage performance based.", "improves coverage performance based."
"improving urban performance evidence." » "improving bank performance evidence.", "improving loan performance evidence.", "improving human performance evidence."

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