Perhaps you should try some spelling variations:
"improving company performance risk." » "improving country performance risk.", "improve company performance risk.", "improving compliance performance risk.", "improving community performance risk.", "improving company performance 2019."
"improving lead performance series." » "improving lead performance studies.", "improving lead performance size.", "improving end performance series.", "improving esd performance series.", "improving reward performance series.", "improving legal performance series.", "improving land performance series.", "improving eap performance series."

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