Perhaps you should try some spelling variations:
passiven » passive, passion
passivieren » passivierende, passieren, passagieren
passivierung » aktivierung
massiveren » massivere, massigeren, massivement
massigen » massiger, massige, massigung

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: (passiven OR ((passivieren OR passivierung) OR (massiveren OR massigen)))*.