Perhaps you should try some spelling variations:
"improving donor performance metrics." » "improving donor performance contracts.", "improving donor performance contract.", "improving poor performance metrics.", "improving monitor performance metrics.", "improving good performance metrics.", "improving indoor performance metrics.", "improving food performance metrics.", "improving labor performance metrics."
"improving under performance measures." » "improving underperformance _ measures.", "improving fund performance measures.", "improving funds performance measures.", "improving gender performance measures.", "improving upper performance measures.", "improving indoor performance measures."

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

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