Perhaps you should try some spelling variations:
"improving company performance based." » "improving country performance based.", "improving loan performance based.", "improving corporate performance based.", "improving human performance based.", "improving company performance measures."
"improving rural performance contracts." » "improving pupil performance contracts.", "improving thermal performance contracts.", "improving overall performance contracts.", "improving urban performance contracts.", "improving social performance contracts."

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