Perhaps you should try some spelling variations:
passiver » passive, passively, passiert
passiverer » passiveer, passivelyer, passierter, passiverwerb, passivieren, passieren
passivierende » passivierender, passivieren, aktivierende
passivenene » passiveene, passionene
passiven » passive, passion

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: (passiver OR ((passivenene OR (passivierende OR passiven)) OR passiverer))*.