Perhaps you should try some spelling variations:
"improving rural performance measures." » "improving euract performance measures.", "improving larval performance measures.", "improving human performance measures."
"improving pupil performance contracts." » "improving social performance contracts.", "improving model performance contracts.", "improving judicial performance contracts.", "improving public performance contracts.", "improving civil performance contracts.", "improving audit performance contracts."

Try widening your search to All Fields.

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