Perhaps you should try some spelling variations:
"improving bank performance metrics." » "improving bank performance measures.", "improving urban performance metrics.", "improving basic performance metrics.", "improving brain performance metrics."
"improving thermal performance series." » "improving thermal performance studies.", "improving thermal performance size.", "improving external performance series.", "improving animal performance series.", "improving erm performance series."

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

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