Perhaps you should try some spelling variations:
"improving larval performance metrics." » "improving larval performance measures.", "improving level performance metrics.", "improving thermal performance metrics.", "improving maximal performance metrics.", "improving local performance metrics.", "improving legal performance metrics.", "improving land performance metrics."
"improving human performance series." » "improving human performance studies.", "improving human performance size.", "improving loan performance series.", "improving thermal performance series.", "improving chain 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 human performance series.") or ("improving larval performance metrics."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving human performance series.") OR ("improving larval performance metrics."))*.
• Removing quotes may allow a broader search: (( improving human performance series. ) or ( improving larval performance metrics. ))*.