Perhaps you should try some spelling variations:
"improve contract performance series." » "improve country performance series.", "improve court performance series.", "improve corporate performance series.", "improve contract performance metrics.", "improve contract performance reviews.", "improve 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: (("improve contract performance series.") OR ("improving road performance review."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"improve contract performance series.\") OR (\"improving road performance review.\"))".
• Removing quotes may allow a broader search: (( improve contract performance series. ) OR ( improving road performance review. )).
• Adding a wildcard symbol may retrieve word variants: (("improve contract performance series.") OR ("improving road performance review."))*.