Perhaps you should try some spelling variations:
passiv » massiv, passiven, passiver
passiveren » massiveren, passiveneren, passivereren, passivieren, passieren, passiverer
passive » massive, passivene, passivere
passivement » massivement, passivenement, passiverement, positivement

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