Perhaps you should try some spelling variations:
passiv » massiv, passiven, passiver
passivieren » massivieren, passivenieren, passiverieren, passivierende, passivierung, passieren
passive » massive, passivene, passivere
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 (massiveren OR passivieren)) OR passive).
• Adding a wildcard symbol may retrieve word variants: ((passiv or (massiveren or passivieren)) or passive)*.