Perhaps you should try some spelling variations:
"improving fund performance contract." » "improving fund performance contracts.", "improving food performance contract.", "improving feed performance contract.", "improving fuel performance contract."
"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 fund performance contract."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving rural performance series.") OR ("improving fund performance contract."))*.
• Removing quotes may allow a broader search: (( improving rural performance series. ) or ( improving fund performance contract. ))*.