Perhaps you should try some spelling variations:
"improving judicial performance contracts." » "improving social performance contracts.", "improving financial performance contracts.", "improving fiscal performance contracts.", "improving municipal performance contracts.", "improve judicial performance contracts."
"improving rural performance series." » "improving rural performance studies.", "improving rural performance size.", "improving euract performance series.", "improving larval performance series.", "improving pupil 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 judicial performance contracts."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving rural performance series.") OR ("improving judicial performance contracts.")).
• Removing quotes may allow a broader search: (( improving rural performance series. ) or ( improving judicial performance contracts. )).
• Adding a wildcard symbol may retrieve word variants: (("improving rural performance series.") or ("improving judicial performance contracts."))*.