Perhaps you should try some spelling variations:
"improving food performance metrics." » "improving food performance measures.", "improving good performance metrics.", "improving fund performance metrics.", "improving bond performance metrics."
"improving care performance series." » "improving care performance studies.", "improving care performance size.", "improving trade performance series.", "improving drive performance series.", "improving 2 performance series.", "improving early performance series.", "improving air performance series.", "improving data 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 care performance series.") or ("improving food performance metrics."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving care performance series.") OR ("improving food performance metrics.")).
• Removing quotes may allow a broader search: (( improving care performance series. ) or ( improving food performance metrics. )).
• Adding a wildcard symbol may retrieve word variants: (("improving care performance series.") or ("improving food performance metrics."))*.