Perhaps you should try some spelling variations:
"improving asset performance review." » "improving asset performance evidence.", "improving dataset performance review.", "improving market performance review.", "improving affect performance review.", "improving adult performance review.", "improving audit performance review.", "improving fast performance review."
"improving firm performance risk." » "improving firm performance 2019.", "improving firms performance risk.", "improving air performance risk.", "improving erm performance risk."

You may be able to get more results by adjusting your search query.

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