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 series." » "improving birth performance reviews.", "improving birth performance review.", "improving birth performance targets.", "improving firm performance series.", "improving high performance series.", "improving port performance series.", "improving air performance series.", "improving health performance series.", "improving growth 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 contract performance metrics.") or ("improving birth performance series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving contract performance metrics.") OR ("improving birth performance series."))*.
• Removing quotes may allow a broader search: (( improving contract performance metrics. ) or ( improving birth performance series. ))*.