Perhaps you should try some spelling variations:
"improving based performance risk." » "improving bank performance risk.", "improving care performance risk.", "improving board performance risk.", "improving based performance size.", "improving based performance based.", "improving based performance _.", "improving basic performance risk.", "improving shared performance risk.", "improving water performance risk."
"improving past performance risk." » "improving past performance size.", "improving past performance based.", "improving past performance _.", "improving plant performance risk.", "improving port performance risk.", "improving bank performance risk.", "improving basic performance risk.", "improving asset performance risk.", "improving land performance risk."

Try widening your search to All Fields.

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