Perhaps you should try some spelling variations:
"improve contract performance metrics." » "improve country performance metrics.", "improve court performance metrics.", "improve economic performance metrics.", "improve contract performance measures.", "improve contrast performance metrics.", "improve content performance metrics.", "improved control performance metrics."
"improving _ performance studies." » "improving _ performance audits.", "improving _ performance audit.", "improving _ performance standards."

You may be able to get more results by adjusting your search query.

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