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

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