Perhaps you should try some spelling variations:
passiv » passive, massiv, passiver
passiven » passiveen, massiven, passiveren, passive, passion
passivieren » passiveieren, massivieren, passiverieren, passivierende, passieren, passagieren
passivierung » passiveierung, massivierung, passiverierung, aktivierung
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 ((massiven OR passiven) OR (passivieren OR passivierung))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(passiv or ((massiven OR passiven) or (passivieren or passivierung)))".
• Adding a wildcard symbol may retrieve word variants: (passiv or ((massiven OR passiven) or (passivieren or passivierung)))*.