Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passiveren » passiveeren, massiveren, passiveneren, passivieren, passiverer, passiven
massigeren » massiger, massigen, massivere
passieren » passiert, passiven

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