Perhaps you should try some spelling variations:
performance series » performance studies, performance size
court performance » country performance, export performance
poor performance » sector performance
improving court » improving our, improving your, improving care
improving poor » improving power, improving food, improving peer

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

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