Perhaps you should try some spelling variations:
"improving contract performance metrics." » "improving country performance metrics.", "improving court performance metrics.", "improving economic performance metrics.", "improving contract performance measures.", "improve contract performance metrics.", "improving central performance metrics.", "improve contrast performance metrics."
"improving board performance evidence." » "improving court performance evidence.", "improving good performance evidence.", "improving based performance evidence.", "improving food performance evidence.", "improving care performance evidence.", "improving blood performance evidence."

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• Performing a fuzzy search may retrieve terms with similar spellings: (("improving contract performance metrics.") or ("improving board performance evidence."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving contract performance metrics.") OR ("improving board performance evidence.")).
• Removing quotes may allow a broader search: (( improving contract performance metrics. ) or ( improving board performance evidence. )).
• Adding a wildcard symbol may retrieve word variants: (("improving contract performance metrics.") or ("improving board performance evidence."))*.