Perhaps you should try some spelling variations:
passiv » passive, passiven, passiver
passiveren » passiveeren, passiveneren, passivereren, passieren, passiverer, passiven
passivieren » passiveieren, passivenieren, passiverieren, passivierende, passivierung, passieren
massiv » massive
massigen » massiger, massige, massigung
massigeren » massiger, massivere, massierer

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