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 local performance metrics."
"improving loan performance series." » "improving loan performance studies.", "improving loan performance size.", "improving local performance series.", "improving land performance series.", "improving lead 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 loan performance series.") OR ("improving level performance metrics."))~.
• Removing quotes may allow a broader search: (( improving loan performance series. ) or ( improving level performance metrics. ))~.
• Adding a wildcard symbol may retrieve word variants: (("improving loan performance series.") or ("improving level performance metrics."))*.