Perhaps you should try some spelling variations:
"improving contract performance series." » "improving country performance series.", "improving court performance series.", "improving corporate performance series.", "improve contract performance series.", "improving central performance series.", "improving coverage performance series.", "improving contract performance metrics.", "improving contract performance reviews.", "improving contract performance targets."
"improving road performance review." » "improving road performance risk.", "improving road performance evidence.", "improving board performance review.", "improving loan performance review.", "improving good performance review.", "improving food performance review.", "improving urban performance review.", "improving rural performance review."

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