Perhaps you should try some spelling variations:
"improving social performance contract." » "improving social performance contracts.", "improving school performance contract.", "improving fiscal performance contract.", "improving financial performance contract."
"improving overall performance evidence." » "improving average performance evidence.", "improving thermal performance evidence.", "improving governance performance evidence.", "improving coverage performance evidence.", "improving rural performance evidence.", "improving federal performance evidence."

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