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