Perhaps you should try some spelling variations:
passiv » passive, passiven
passiver » passiveer, passivener, passive, passiven, passively
passiveeren » passiveeeren, passiveneeren, passieren, passiverer, passivierende
passivieren » passiveieren, passivenieren, 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 passiver) OR massiv) OR (passiveeren OR (massigeren OR passivieren))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((passiv OR passiver) or massiv) or (passiveeren or (massigeren or passivieren)))".
• Adding a wildcard symbol may retrieve word variants: (((passiv OR passiver) or massiv) or (passiveeren or (massigeren or passivieren)))*.