Perhaps you should try some spelling variations:
passiv » massiv, passiven, passiver
passive » massive, passivene, passivere
passiverwerb » massiverwerb, passivenerwerb, passivererwerb, passiverer
passiveren » massiveren, passiveneren, passivereren, passivieren, passieren, passiverer

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 ((passiverwerb OR passiveren) OR passiert)).
• Adding a wildcard symbol may retrieve word variants: ((passiv or passive) or ((passiverwerb or passiveren) or passiert))*.