Perhaps you should try some spelling variations:
"improving human performance metrics." » "improving human performance measures.", "improving loan performance metrics.", "improving thermal performance metrics.", "improving chain performance metrics."
"improving annual performance contracts." » "improving fiscal performance contracts.", "improving social performance contracts.", "improving financial performance contracts.", "improving animal performance contracts.", "improving sexual performance contracts.", "improving antenatal performance contracts."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("improving human performance metrics.") or ("improving annual performance contracts."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving human performance metrics.") OR ("improving annual performance contracts."))*.
• Removing quotes may allow a broader search: (( improving human performance metrics. ) or ( improving annual performance contracts. ))*.