Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivenner » passiveenner, massivenner, passivenenner, passiverer, klassevenner, passiverwerb
massiverer » massivere, massierer, passiverer
massivene » massiven, massivere, massive

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 massiverer)) OR massivene)*.