Perhaps you should try some spelling variations:
passiv » massiv, passiver
passiven » massiven, passiveren, passion
passiverer » massiverer, passivererer, passivieren, passiver, passieren, passiverr, passivierenr
passiverwerb » massiverwerb, passivererwerb
passive » massive, passivere
passivere » massivere, passiverere, passiver, passivieren

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 passiven) OR (passiverer OR passiverwerb)) OR (passive OR passivere)).
• Adding a wildcard symbol may retrieve word variants: (((passiv or passiven) or (passiverer or passiverwerb)) or (passive or passivere))*.