Perhaps you should try some spelling variations:
"improving pupil performance metrics." » "improving pupil performance measures.", "improving social performance metrics.", "improving model performance metrics.", "improving judicial performance metrics.", "improving public performance metrics.", "improving civil performance metrics.", "improving audit 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 pupil performance metrics."))~.
• Removing quotes may allow a broader search: (( improving loan performance series. ) or ( improving pupil performance metrics. ))~.
• Adding a wildcard symbol may retrieve word variants: (("improving loan performance series.") or ("improving pupil performance metrics."))*.