Perhaps you should try some spelling variations:
"improving mental performance measures." » "improving general performance measures.", "improving senegal performance measures.", "improving annual performance measures.", "improving maternal performance measures.", "improving fiscal performance measures.", "improving gender performance measures."
"improving human performance reports." » "improving loan performance reports.", "improving thermal performance reports.", "improving chain performance reports.", "improving human performance report."

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

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