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 urban performance reports." » "improving bank performance reports.", "improving loan performance reports.", "improving human performance reports.", "improving urban 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 urban performance reports.") OR ("improving power performance metrics."))~.
• Removing quotes may allow a broader search: (( improving urban performance reports. ) or ( improving power performance metrics. ))~.
• Adding a wildcard symbol may retrieve word variants: (("improving urban performance reports.") or ("improving power performance metrics."))*.