Perhaps you should try some spelling variations:
"improving coverage performance metrics." » "improving average performance metrics.", "improving overall performance metrics.", "improving governance performance metrics.", "improving coverage performance measures.", "improved coverage performance metrics.", "improves coverage performance metrics."
"improving local performance series." » "improving local performance studies.", "improving local performance size.", "improving social performance series.", "improving global performance series.", "improving total performance series.", "improving fiscal 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 coverage performance metrics.") or ("improving local performance series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving coverage performance metrics.") OR ("improving local performance series.")).
• Removing quotes may allow a broader search: (( improving coverage performance metrics. ) or ( improving local performance series. )).
• Adding a wildcard symbol may retrieve word variants: (("improving coverage performance metrics.") or ("improving local performance series."))*.