Perhaps you should try some spelling variations:
performance studies » performance audits, performance audit, performance standards
performance review » performance risk, performance evidence
rural performance » euract performance, larval performance, pupil performance
der performance » order performance, under performance, zur performance
improving der » improving deep, improving air, improving e

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