Perhaps you should try some spelling variations:
"improving human performance metrics." » "improving human performance measures.", "improving human performance contract.", "improving loan performance metrics.", "improving thermal performance metrics.", "improving company performance metrics.", "improving urban performance metrics."
"improving rural performance contracts." » "improving pupil performance contracts.", "improving thermal performance contracts.", "improving overall performance contracts.", "improving urban performance contracts.", "improving social 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 rural performance contracts."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving human performance metrics.") OR ("improving rural performance contracts."))*.
• Removing quotes may allow a broader search: (( improving human performance metrics. ) or ( improving rural performance contracts. ))*.