Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivenner » passiveenner, massivenner, passivenenner, klassevenner, passiverwerb
passiverer » passiveerer, massiverer, passivenerer, passiverwerb, passivieren, passiver
massivere » massiver, massive, massively

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: ((passiv OR (passivenner OR passiverer)) OR massivere)*.