Perhaps you should try some spelling variations:
"improving contract performance contract." » "improving country performance contract.", "improving court performance contract.", "improving economic performance contract.", "improving contract performance contracts.", "improve contract performance contract.", "improving central performance contract.", "improve contrast performance contract."
"improving food performance reviews." » "improving food performance review.", "improving food performance reports.", "improving food performance risks.", "improving good performance reviews.", "improving fund performance reviews.", "improving bond performance reviews."

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