Perhaps you should try some spelling variations:
"improving rural performance metrics." » "improving rural performance contracts.", "improving rural performance measures.", "improving rural performance contract.", "improving pupil performance metrics.", "improving thermal performance metrics.", "improving overall performance metrics.", "improving social performance metrics."
"improving urban performance targets." » "improving bank performance targets.", "improving loan performance targets.", "improving can performance targets."

Try widening your search to All Fields.

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