Perhaps you should try some spelling variations:
"improving co performance metrics." » "improving co performance measures.", "improving ceo performance metrics.", "improving do performance metrics.", "improving core performance metrics.", "improving eco performance metrics.", "improving crop performance metrics.", "improving ict performance metrics."
"improving data performance series." » "improving data performance studies.", "improving data performance size.", "improving data performances series.", "improving drama performance series.", "improving cta performance series.", "improving air performance series.", "improving health 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 data performance series.") or ("improving co performance metrics."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving data performance series.") OR ("improving co performance metrics."))*.
• Removing quotes may allow a broader search: (( improving data performance series. ) or ( improving co performance metrics. ))*.