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 firms performance targets." » "improving firm performance targets.", "improving firm performances targets.", "improving funds performance targets.", "improving farmers performance targets.", "importing firms performance targets.", "improving air performance targets."

Try widening your search to All Fields.

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 firms performance targets."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving human performance metrics.") OR ("improving firms performance targets.")).
• Removing quotes may allow a broader search: (( improving human performance metrics. ) or ( improving firms performance targets. )).
• Adding a wildcard symbol may retrieve word variants: (("improving human performance metrics.") or ("improving firms performance targets."))*.