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

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