Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passiverer » passiveerer, massiverer, passivenerer, passivieren, passieren, passagerer, passiveer, passivener, passivelyer
passiverwerb » passiveerwerb, massiverwerb, passivenerwerb, passivewerb, passivenwerb, passivelywerb
passivewerb » passiveewerb, massivewerb, passivenewerb
passiver » passiveer, massiver, passivener, passive, passiven, passively

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