Perhaps you should try some spelling variations:
"improving voluntary performance risk." » "improving country performance risk.", "improving entry performance risk.", "improving budgetary performance risk.", "improving voluntary performance size.", "improving voluntary performance based.", "improving voluntary performance _."
"improving urban performance targets." » "improving bank performance targets.", "improving loan performance targets.", "improving can performance targets."

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

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