Perhaps you should try some spelling variations:
passiv » massiv
passiver » massiver, passively, passiert
passiven » massiven, passion
passivenener » massivenener, passionener, passivierender
passiverer » massiverer, passivelyer, passierter, passiverwerb, passivieren, passieren
passive » massive

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