Perhaps you should try some spelling variations:
"improving rural performance contract." » "improving rural performance contracts.", "improving pupil performance contract.", "improving thermal performance contract.", "improving overall performance contract.", "improving urban performance contract.", "improving social performance contract."
"improving bank performance series." » "improving bank performance metrics.", "improving bank performance reviews.", "improving bank performance review.", "improving market performance series.", "improving _ performance series.", "improving firm performance series.", "improving land performance series.", "improving urban performance series.", "improving basic 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 bank performance series.") or ("improving rural performance contract."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving bank performance series.") OR ("improving rural performance contract.")).
• Removing quotes may allow a broader search: (( improving bank performance series. ) or ( improving rural performance contract. )).
• Adding a wildcard symbol may retrieve word variants: (("improving bank performance series.") or ("improving rural performance contract."))*.