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."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("improving rural performance series.") OR ("improving judicial performance contracts."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"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."))*.