Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passiverer » passiveerer, massiverer, passivenerer, passivieren, passiver, passieren
passiverwerb » passiveerwerb, massiverwerb, passivenerwerb
passiveer » passiveeer, massiveer, passiveneer, passiver, passiviert, passive

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 passiveer)*.