Perhaps you should try some spelling variations:
"improving firm performance metrics." » "improving firm performance measures.", "improving firms performance metrics.", "improving air performance metrics.", "improving erm performance metrics."
"improving plant performance reports." » "improving port performance reports.", "improving court performance reports.", "improving land performance reports.", "improving place performance reports.", "improved plant performance reports.", "improving plant performance report."

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 plant performance reports.") OR ("improving firm performance metrics."))~.
• Removing quotes may allow a broader search: (( improving plant performance reports. ) or ( improving firm performance metrics. ))~.
• Adding a wildcard symbol may retrieve word variants: (("improving plant performance reports.") or ("improving firm performance metrics."))*.