Perhaps you should try some spelling variations:
passiv » passive, massiv
passiven » passiveen, massiven, passive, passion
passiverer » passiveerer, massiverer, passiverwerb, passivieren, passieren, passiveer, passivelyer, passierter
passiver » passiveer, massiver, passive, passively, passiert
massiveren » massivere, massigeren, massivement

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