Perhaps you should try some spelling variations:
"improving power performance metrics." » "improving power performance measures.", "improving poor performance metrics.", "improving worker performance metrics.", "improving core performance metrics.", "improving peer performance metrics.", "improving sewer 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 power performance metrics."))~.
• Removing quotes may allow a broader search: (( improving loan performance series. ) or ( improving power performance metrics. ))~.
• Adding a wildcard symbol may retrieve word variants: (("improving loan performance series.") or ("improving power performance metrics."))*.