Perhaps you should try some spelling variations:
"improving thermal performance metrics." » "improving thermal performance measures.", "improving external performance metrics.", "improving animal performance metrics.", "improving erm performance metrics."
"improving water performance reviews." » "improving water performance review.", "improving water performance reports.", "improving water performance risks.", "improving rate performance reviews.", "improving rated performance reviews.", "improving rates performance reviews."

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