Perhaps you should try some spelling variations:
"improving level performance metrics." » "improving level performance measures.", "improving model performance metrics.", "improving revenue performance metrics.", "improving pupil performance metrics.", "improving legal performance metrics.", "improving lives performance metrics.", "improving civil 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."

Try widening your search to All Fields.

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

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