Perhaps you should try some spelling variations:
passiv » passive, massiv
passiver » passiveer, massiver, passive, passively, passiert
passiven » passiveen, massiven, passive, passion
passiveren » passiveeren, massiveren, passiveen, passivelyen, passierten, passivieren, passieren, passiverer

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 (passiven OR passiveren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passiv OR passiver) or (passiven or passiveren))*".