Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passiveren » passiveeren, massiveren, passiveneren, passivieren, passieren, passiverer, passiveen, passivenen, passivelyen
passiveeren » passiveeeren, massiveeren, passiveneeren, passivieren, passieren, passiverer
passiver » passiveer, massiver, passivener, passive, passiven, passively
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 (passiveren OR passiveeren)) OR (passiver OR massivere)).
• Adding a wildcard symbol may retrieve word variants: ((passiv or (passiveren or passiveeren)) or (passiver or massivere))*.