Perhaps you should try some spelling variations:
"improving overall performance contracts." » "improving average performance contracts.", "improving thermal performance contracts.", "improving governance performance contracts.", "improving coverage performance contracts.", "improving federal performance contracts.", "improving neural performance contracts."
"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 rural performance measures.") or ("improving overall performance contracts."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving rural performance measures.") OR ("improving overall performance contracts.")).
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