Perhaps you should try some spelling variations:
"improving national performance metrics." » "improving regional performance metrics.", "improving operational performance metrics.", "improving educational performance metrics.", "improving maternal performance metrics.", "improving natural performance metrics.", "improve national performance metrics."
"improving rural performance measures." » "improving euract performance measures.", "improving larval performance measures.", "improving pupil performance measures."

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