Perhaps you should try some spelling variations:
"improving overall performance risk." » "improving average performance risk.", "improving thermal performance risk.", "improving governance performance risk.", "improving coverage performance risk.", "improving rural performance risk.", "improving federal performance risk.", "improving overall performance 2019."
"improving larval performance targets." » "improving level performance targets.", "improving thermal performance targets.", "improving maximal performance targets.", "improving local performance targets.", "improving legal performance targets.", "improving land performance targets."

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

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