Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivieren » passiveieren, massivieren, passivenieren, passivierende, passivierung, passieren
massivieren » massivere, massigeren, passivierende
massivierung » passivierung, passivierungs, massierung
massiveren » massivere, massigeren, massivement

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 massivierung) OR (massiveren OR passivieren))).
• Adding a wildcard symbol may retrieve word variants: (passiv or ((massivieren or massivierung) or (massiveren or passivieren)))*.