Perhaps you should try some spelling variations:
transformer based » transformer les, transport based, transformation based
student transfer » student transfers, student teacher
der transformer » dc transformer, se transformer, der transferamter
based across » based access, shared across, varied across
transfer bei » transfer beim, transfers bei, transfer der
2 student » a student, 3.2 students
luis 2 » luis f, luis c, luis a
bis » bias
ende » ended, end, ends
macao » macro, macau, cacao

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( bis ende der transformer based across ) OR ( luis 2 student transfer bei macao ))~.
• Adding a wildcard symbol may retrieve word variants: (( bis ende der transformer based across ) or ( luis 2 student transfer bei macao ))*.