Perhaps you should try some spelling variations:
"improving basic performance metrics." » "improving basic performance measures.", "improving based performance metrics.", "improving music performance metrics.", "improving baseline performance metrics.", "improving air performance metrics.", "improve basic performance metrics."
"improving public performance review." » "improving music performance review.", "improving policy performance review.", "improving public performance risk.", "improving public performance evidence."

Try widening your search to All Fields.

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

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