Perhaps you should try some spelling variations:
"improving railway performance contract." » "improving railway performance contracts.", "improving utility performance contract.", "improving rail performance contract.", "improving early performance contract."
"improving rural performance review." » "improving rural performance risk.", "improving rural performance evidence.", "improving pupil performance review.", "improving thermal performance review.", "improving overall performance review.", "improving urban performance review.", "improving social performance review."

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