Perhaps you should try some spelling variations:
"improving public performance review." » "improving music performance review.", "improving policy performance review.", "improving public performance risk.", "improving public performance evidence."
"improving multi performance review." » "improving multi performance risk.", "improving multi performance evidence.", "improving multiple performance review.", "improving mpi performance review.", "improving results performance review.", "improving adult performance review.", "improving culture performance review."

Try widening your search to All Fields.

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