Perhaps you should try some spelling variations:
"improving food performance contract." » "improving food performance contracts.", "improving good performance contract.", "improving poor performance contract.", "improving fund performance contract.", "improving land performance contract."
"improving company performance series." » "improving country performance series.", "improving loan performance series.", "improving corporate performance series.", "improving company performance metrics.", "improving company performance reviews.", "improving company performance review.", "improving human 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 company performance series.") or ("improving food performance contract."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving company performance series.") OR ("improving food performance contract."))*.
• Removing quotes may allow a broader search: (( improving company performance series. ) or ( improving food performance contract. ))*.