Perhaps you should try some spelling variations:
"improving animal performance measures." » "improving annual performance measures.", "improving thermal performance measures.", "improving fiscal performance measures.", "improving initial performance measures.", "improving optimal performance measures.", "improving criminal performance measures."
"improving rural performance metrics." » "improving euract performance metrics.", "improving larval performance metrics.", "improving pupil performance metrics."

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