Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passiveeren » passiveeeren, passiveneeren, passivereeren, passivieren, passieren, passiverer
passiveieren » passiveeieren, passiveneieren, passivereieren, passivieren, passionierten, passivierende
massiv » massive
massigen » massiger, massige, massigung
massigeren » massiger, massivere, massierer

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