Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
massivieren » passivieren, passivierende, passivierung
massigeren » massiger, massigen, massierer
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 (massivieren OR (massigeren OR massivere)))*.