Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivierung » passiveierung, massivierung, passivenierung, aktivierung
passivieren » passiveieren, massivieren, passivenieren, passivierende, passieren, passagieren
massivieren » massigeren, passivierende, massivdecken
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 passivierung) OR (massivere OR passivieren))).
• Adding a wildcard symbol may retrieve word variants: (passiv or ((massivieren or passivierung) or (massivere or passivieren)))*.