Perhaps you should try some spelling variations:
passiv » passive, massiv, passiver
passiven » passiveen, massiven, passiveren, passive, passion
massivieren » passivieren, massivere, massigeren
massigen » massiger, massige, massigung
massiveeren » massivere, passivieren, massigeren

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 passiven) OR (massivieren OR (massigen OR massiveeren))).
• Adding a wildcard symbol may retrieve word variants: ((passiv or passiven) or (massivieren or (massigen or massiveeren)))*.