Perhaps you should try some spelling variations:
passiv » massiv, passiver
passiven » massiven, passiveren, passion
passivener » massivener, passiverener, passioner, passiverer, passiver, passiverwerb
passiverener » massiverener, passivererener, passivierender, passiverer, passivierenden
passive » massive, passivere
massiven » massively, massiv

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 massiven)) OR (passivener OR passiverener)) OR (passive OR massive)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((passiv or (passiven OR massiven)) or (passivener or passiverener)) or (passive or massive))".
• Adding a wildcard symbol may retrieve word variants: (((passiv or (passiven OR massiven)) or (passivener or passiverener)) or (passive or massive))*.