Perhaps you should try some spelling variations:
"improving contract performance series." » "improving country performance series.", "improving court performance series.", "improving economic performance series.", "improve contract performance series.", "improving central performance series.", "improve contrast performance series.", "improving contract performance studies.", "improving contract performance size."
"improving local performance evidence." » "improving social performance evidence.", "improving global performance evidence.", "improving total performance evidence.", "improving fiscal performance evidence."

You may be able to get more results by adjusting your search query.

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