Perhaps you should try some spelling variations:
passiv » massiv, passiven, passiver
passiveren » massiveren, passiveneren, passivereren, passivieren, passiverer, passiven
passive » massive, passivene, passivere
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 passieren)) OR passive).
• Adding a wildcard symbol may retrieve word variants: ((passiv or (passiveren or passieren)) or passive)*.