Perhaps you should try some spelling variations:
passiv » massiv, passiven, passiver
passivener » massivener, passivenener, passiverener, passiverer, passiven, passiver
passiverener » massiverener, passivenerener, passivererener, passivierender, passiverer, passivierenden
passive » massive, passivene, passivere

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