Perhaps you should try some spelling variations:
"improving primary performance metrics." » "improving preliminary performance metrics.", "improving animal performance metrics.", "improving optimal performance metrics.", "improving primary performance measures."
"improving erm performance metrics." » "improving erm performance measures.", "improving esm performance metrics.", "improving firm performance metrics.", "improving team performance metrics.", "improving ers performance metrics.", "improving e performance metrics.", "improving eap performance metrics."

Try widening your search to All Fields.

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

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