Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivenner » passiveenner, massivenner, passivenenner, klassevenner
passiverer » passiveerer, massiverer, passivenerer, passivieren, passiver, passieren
passiverwerb » passiveerwerb, massiverwerb, passivenerwerb
passiveand » passiveeand, massiveand, passiveneand, passiven

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