Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passivener » passiveener, passivenener, passiverener, passiverer, passiven, passiver
passiveeren » passiveeeren, passiveneeren, passivereeren, passieren, passiverer, passivierende
passivieren » passiveieren, passivenieren, passiverieren, passivierende, passivierung, passieren
massiv » massive
massigeren » massiger, massigen, massivere

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 passivener) OR massiv) OR (passiveeren OR (massigeren OR passivieren))).
• Adding a wildcard symbol may retrieve word variants: (((passiv or passivener) or massiv) or (passiveeren or (massigeren or passivieren)))*.