Perhaps you should try some spelling variations:
"improving mental performance metrics." » "improving mental performance measures.", "improving general performance metrics.", "improving senegal performance metrics.", "improving annual performance metrics.", "improving maternal performance metrics.", "improving fiscal performance metrics.", "improving gender performance metrics."
"improving water performance risk." » "improving rate performance risk.", "improving rated performance risk.", "improving rates performance risk.", "improving water performance 2019."

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