Perhaps you should try some spelling variations:
passiv » massiv, passiven, passiver
passive » massive, passivene, passivere
passiveren » massiveren, passiveneren, passivereren, passivieren, passiverer, passiven
passieren » passiert, passiven

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 (passiveren OR passieren)))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(passiv or (passive or (passiveren OR passieren)))*".