Perhaps you should try some spelling variations:
"improving past performance based." » "improving past performance measures.", "improving plant performance based.", "improving port performance based.", "improving based performance based.", "improving basic performance based.", "improving asset performance based.", "improving land performance based."
"improving urban performance risk." » "improving bank performance risk.", "improving loan performance risk.", "improving can performance risk.", "improving urban performance size.", "improving urban performance _.", "improving urban performance data."

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