Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
massivieren » passivieren, massivere, passivierende
massigeren » massiger, massigen, massivere
massiver » massive, massiven, passiver

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 massiver)))*.