Perhaps you should try some spelling variations:
passiv » passive, massiv, passiver
passiven » passiveen, massiven, passiveren, passive, passion
passivieren » passiveieren, massivieren, passiverieren, passivierende, passivierung, passieren
massiverer » massivere, massierer, passiverer

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 (passiven OR (massiverer OR passivieren))).
• Adding a wildcard symbol may retrieve word variants: (passiv or (passiven or (massiverer or passivieren)))*.