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

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