Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passiveren » passiveeren, passiveneren, passivereren, passivieren, passieren, passiverer
passiveieren » passiveeieren, passiveneieren, passivereieren, passivieren, passionierten, passivierende
massiv » massive
massivere » massiveere, massiver, massive, massively
massigung » massing, massigen

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