Perhaps you should try some spelling variations:
"improving can performance metrics." » "improving can performance measures.", "improving chain performance metrics.", "improving loan performance metrics.", "improving human performance metrics.", "improving care performance metrics.", "improving a performance metrics.", "improving co performance metrics."
"improving urban performance series." » "improving urban performance studies.", "improving urban performance size.", "improving bank performance series.", "improving loan performance series.", "improving human performance series."

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("improving urban performance series.") or ("improving can performance metrics."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving urban performance series.") OR ("improving can performance metrics."))*.
• Removing quotes may allow a broader search: (( improving urban performance series. ) or ( improving can performance metrics. ))*.