Perhaps you should try some spelling variations:
"improving mental performance targets." » "improving general performance targets.", "improving senegal performance targets.", "improving annual performance targets.", "improving maternal performance targets.", "improving fiscal performance targets.", "improving gender performance targets."
"improving rural performance measures." » "improving euract performance measures.", "improving larval performance measures.", "improving pupil performance measures."

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

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