Perhaps you should try some spelling variations:
"improving seismic performance metrics." » "improving economic performance metrics.", "improving academic performance metrics.", "improving semantic performance metrics.", "improving service performance metrics.", "improving basic performance metrics."
"improving past performance measures." » "improving plant performance measures.", "improving port performance measures.", "improving transit performance measures.", "improving fast performance measures.", "improving post performance measures."

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