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

Try widening your search to All Fields.

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