Perhaps you should try some spelling variations:
"improving rural performance contract." » "improving rural performance contracts.", "improving euract performance contract.", "improving larval performance contract.", "improving pupil performance contract."
"improving firms performance series." » "improving firms performance studies.", "improving firms performance size.", "improving firm performance series.", "improving firm performances series.", "improving funds performance series.", "improving farmers performance series.", "importing firms performance series.", "improving air performance series."

Try widening your search to All Fields.

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 contract.") or ("improving firms performance series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving rural performance contract.") OR ("improving firms performance series.")).
• Removing quotes may allow a broader search: (( improving rural performance contract. ) or ( improving firms performance series. )).
• Adding a wildcard symbol may retrieve word variants: (("improving rural performance contract.") or ("improving firms performance series."))*.