Perhaps you should try some spelling variations:
"improving central performance evidence." » "improving control performance evidence.", "improving general performance evidence.", "improving contract performance evidence.", "improving mental performance evidence.", "improving federal performance evidence.", "improving neural performance evidence."
"improving loan performance targets." » "improving local performance targets.", "improving land performance targets.", "improving lead performance targets."

Try widening your search to All Fields.

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