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

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

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