Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passiveren » passiveeren, passiveneren, passivereren, passieren, passiverer, passiven
passiveieren » passiveeieren, passiveneieren, passivereieren, passionierten, passivierende, passieren
passivieren » passiveieren, passivenieren, passiverieren, passivierende, passivierung, passieren
massiv » massive
massigen » massiger, massige, massigung

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 massiv) OR ((passiveren OR passiveieren) OR (massigen OR passivieren))).
• Adding a wildcard symbol may retrieve word variants: ((passiv or massiv) or ((passiveren or passiveieren) or (massigen or passivieren)))*.