Perhaps you should try some spelling variations:
passiv » massiv, passiven, passiver
passive » massive, passivene, passivere
passivener » massivener, passivenener, passiverener, passiven, passiver, passiverwerb
passiverer » massiverer, passivenerer, passivererer, passiverwerb, passivieren, passiver

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