Perhaps you should try some spelling variations:
passiv » passive, massiv, passiven
passivenere » passiveenere, massivenere, passivenenere
passiverer » passiveerer, massiverer, passivenerer, passivieren, passiver, passieren
passiverwerb » passiveerwerb, massiverwerb, passivenerwerb

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 (passivenere OR (passiverer OR passiverwerb))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(passiv or (passivenere or (passiverer OR passiverwerb)))".
• Adding a wildcard symbol may retrieve word variants: (passiv or (passivenere or (passiverer OR passiverwerb)))*.