Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivenner » passiveenner, massivenner, passivenenner, klassevenner
passiverwerb » passiveerwerb, massiverwerb, passivenerwerb
passiverer » passiveerer, massiverer, passivenerer, passivieren, passiver, passieren
passivene » passiveene, massivene, passivenene, passiven, passiveand, 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 ((passivenner OR passiverwerb) OR passiverer)) OR passivene)*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passiv or ((passivenner OR passiverwerb) or passiverer)) or passivene)*".