Perhaps you should try some spelling variations:
"improving overall performance measures." » "improving average performance measures.", "improving thermal performance measures.", "improving governance performance measures.", "improving coverage performance measures.", "improving federal performance measures.", "improving neural performance measures."
"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 measures."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("improving rural performance targets.") OR ("improving overall performance measures.")).
• Removing quotes may allow a broader search: (( improving rural performance targets. ) or ( improving overall performance measures. )).
• Adding a wildcard symbol may retrieve word variants: (("improving rural performance targets.") or ("improving overall performance measures."))*.