Perhaps you should try some spelling variations:
passiv » passive, massiv, passiver
passiven » passiveen, massiven, passiveren, passive, passion
passivieren » passiveieren, massivieren, passiverieren, passivierende, passivierung, passagieren
passiverwerb » passiveerwerb, massiverwerb, passivererwerb, passiverer
passivenerwerb » passiveenerwerb, massivenerwerb, passiverenerwerb, passiveerwerb, passionerwerb
passieren » passiert

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