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

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 massiven) OR ((passiven OR passiveren) OR passiert))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(passiv or ((passivieren or massiven) or ((passiven OR passiveren) or passiert)))".
• Adding a wildcard symbol may retrieve word variants: (passiv or ((passivieren or massiven) or ((passiven OR passiveren) or passiert)))*.