Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passiveeren » passiveeeren, massiveeren, passiveneeren, passivieren, passieren, passiverer
passiver » passiveer, massiver, passivener, passive, passiven, passively
massivieren » passivieren, massigeren, passivierende
massivere » massiver, massive, massively

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 (passiveeren OR massivieren)) OR (passiver OR massivere)).
• Adding a wildcard symbol may retrieve word variants: ((passiv or (passiveeren or massivieren)) or (passiver or massivere))*.