Perhaps you should try some spelling variations:
explant performance » export performance, export performances, exam performance
performance series » performance metrics, performance reviews, performance review
improving explant » improving export, improving land, improving employment
plant performance » bank performance, loan performance, port performance
improving plant » improving land, improving laws, improving payment

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

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