Perhaps you should try some spelling variations:
"improving external performance evidence." » "improving emotional performance evidence.", "improving materials performance evidence.", "improving thermal performance evidence.", "improving maternal performance evidence.", "improving central performance evidence.", "improving federal performance evidence."
"improving human performance metrics." » "improving human performance measures.", "improving loan performance metrics.", "improving thermal performance metrics.", "improving chain performance metrics."

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