Perhaps you should try some spelling variations:
passiv » massiv, passiven
passive » massive, passivene
passiverwerb » massiverwerb, passivenerwerb, passiverer, passivenwerb, passiertwerb
passiver » massiver, passivener, passiven, passiert
passively » massively, passivenely, passivity, 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 (passive OR massive)) OR (passiverwerb OR (passiver OR passively))).
• Adding a wildcard symbol may retrieve word variants: ((passiv or (passive or massive)) or (passiverwerb or (passiver or passively)))*.