Perhaps you should try some spelling variations:
"improving shared performance based." » "improving sharia performances based.", "improving sharing performance based.", "improving care performance based.", "improving stored performance based.", "improving sales performance based."
"improving firm performances risk." » "improving firm performance risk.", "improving firms performance risk.", "improving from performance risk.", "improving firm performance risks.", "improving firm performances during.", "improving firms performances risk.", "improving air performances risk.", "improving erm performances 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 shared performance based.") or ("improving firm performances risk."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving shared performance based.") OR ("improving firm performances risk.")).
• Removing quotes may allow a broader search: (( improving shared performance based. ) or ( improving firm performances risk. )).
• Adding a wildcard symbol may retrieve word variants: (("improving shared performance based.") or ("improving firm performances risk."))*.