Perhaps you should try some spelling variations:
passiver » passive, passiven, passively
massiv » massive
massiveeren » massiveeeren, massivere, passivieren, massigeren
passiveeeren » passivieren, passieren, passiverer
passiveieren » passivieren, passionierten, passivierende
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: ((passiver OR massiv) OR ((passiveeeren OR passiveieren) OR (massigen OR massiveeren))).
• Adding a wildcard symbol may retrieve word variants: ((passiver or massiv) or ((passiveeeren or passiveieren) or (massigen or massiveeren)))*.