Perhaps you should try some spelling variations:
"improving pupil performance metrics." » "improving pupil performance contracts.", "improving pupil performance measures.", "improving pupil performance contract.", "improving social performance metrics.", "improving fund performance metrics.", "improving judicial performance metrics.", "improving public performance metrics.", "improving supply performance metrics.", "improving civil performance metrics."
"improving rural performance series." » "improving rural performance reviews.", "improving rural performance review.", "improving rural performance targets.", "improving thermal performance series.", "improving overall performance series.", "improving fiscal performance series.", "improving urban performance series.", "improving social performance series."

Try widening your search to All Fields.

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