Perhaps you should try some spelling variations:
performance metrics » performance measures
performance series » performance studies, performance size
rural performance » euract performance, larval performance, pupil performance
past performance » plant performance, port performance, transit performance
improve past » improve post, improve asi, improve cost

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( improve past performance series. ) or ( improving rural performance metrics. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( improve past performance series. ) OR ( improving rural performance metrics. )).
• Adding a wildcard symbol may retrieve word variants: (( improve past performance series. ) or ( improving rural performance metrics. ))*.