Perhaps you should try some spelling variations:
performance metrics » performance measures
performance series » performance studies, performance size
rural performance » euract performance, larval performance, human performance
pupil performance » social performance, model performance, judicial performance
improving pupil » improving public, improving civil, improving audit

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 series. ) or ( improving pupil performance metrics. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( improving rural performance series. ) OR ( improving pupil performance metrics. )).
• Adding a wildcard symbol may retrieve word variants: (( improving rural performance series. ) or ( improving pupil performance metrics. ))*.