Perhaps you should try some spelling variations:
passiven » passive, passion
passivene » passivee, passione, passiverer, passive, passiver
passivierende » passivierender, passivieren, aktivierende
passively » massively, passive, passivity

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: (passiven OR ((passivene OR (passivierende OR passiveand)) OR passively))*.