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 bank performance targets." » "improving market performance targets.", "improving _ performance targets.", "improving firm performance targets.", "improving land performance targets.", "improving urban performance targets.", "improving basic 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 bank performance targets.") or ("improving voluntary performance risk."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving bank performance targets.") OR ("improving voluntary performance risk.")).
• Removing quotes may allow a broader search: (( improving bank performance targets. ) or ( improving voluntary performance risk. )).
• Adding a wildcard symbol may retrieve word variants: (("improving bank performance targets.") or ("improving voluntary performance risk."))*.