Perhaps you should try some spelling variations:
"improving do performance metrics." » "improving do performance measures.", "improving di performance metrics.", "improving 2 performance metrics.", "improving 3 performance metrics.", "improving co performance metrics.", "improving eco performance metrics.", "improving pro performance metrics."
"improving export performance series." » "improving export performance studies.", "improving export performance size.", "improving exposure performance series.", "improving eap performance series.", "improving eco performance series."

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

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