Perhaps you should try some spelling variations:
passiv » massiv, passiven, passiver
passive » massive, passivene, passivere
passiveeren » massiveeren, passiveneeren, passivereeren, passivieren, passieren, passivierende
passiverer » massiverer, passivenerer, passivererer, passiverwerb, passivieren, passiver
massiven » massive, passiven, massively
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: (passiv OR ((passive OR massiven) OR (massigen OR (passiveeren OR passiverer)))).
• Adding a wildcard symbol may retrieve word variants: (passiv or ((passive or massiven) or (massigen or (passiveeren or passiverer))))*.