Perhaps you should try some spelling variations:
"improving contract performance metrics." » "improving country performance metrics.", "improving court performance metrics.", "improving corporate performance metrics.", "improving contract performance contracts.", "improving contract performance measures.", "improving contract performance contract.", "improve contract performance metrics.", "improving central performance metrics.", "improving coverage performance metrics."
"improving birth performance targets." » "improving firm performance targets.", "improving high performance targets.", "improving port performance targets.", "improving air performance targets.", "improving health performance targets.", "improving growth performance targets."

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 metrics.") or ("improving birth performance targets."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving contract performance metrics.") OR ("improving birth performance targets."))*.
• Removing quotes may allow a broader search: (( improving contract performance metrics. ) or ( improving birth performance targets. ))*.