Perhaps you should try some spelling variations:
"improving overall performance metrics." » "improving average performance metrics.", "improving thermal performance metrics.", "improving governance performance metrics.", "improving overall performance measures.", "improving coverage performance metrics.", "improving federal performance metrics.", "improving neural performance metrics."
"improving rural performance targets." » "improving euract performance targets.", "improving larval performance targets.", "improving pupil performance targets."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("improving rural performance targets.") OR ("improving overall performance metrics."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"improving rural performance targets.\") OR (\"improving overall performance metrics.\"))".
• Removing quotes may allow a broader search: (( improving rural performance targets. ) OR ( improving overall performance metrics. )).
• Adding a wildcard symbol may retrieve word variants: (("improving rural performance targets.") OR ("improving overall performance metrics."))*.