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

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 animal performance metrics.") or ("improving rural performance contracts."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving animal performance metrics.") OR ("improving rural performance contracts.")).
• Removing quotes may allow a broader search: (( improving animal performance metrics. ) or ( improving rural performance contracts. )).
• Adding a wildcard symbol may retrieve word variants: (("improving animal performance metrics.") or ("improving rural performance contracts."))*.