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 social performance series." » "improving school performance series.", "improving fiscal performance series.", "improving financial performance series.", "improving social performance studies.", "improving social performance size."

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