Perhaps you should try some spelling variations:
massiv » massive
massiverer » massiveerer, massivere, massierer, massiver
passiverer » passiverwerb, passivieren, passieren, passiveer, passivener, passivelyer
passiver » passive, passiven, passively

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: (massiv OR (passiverer OR (massiverer OR passiver)))*.