Perhaps you should try some spelling variations:
passiv » massiv, passiver
passiven » massiven, passiveren, passion
passive » massive, passivere
massivener » massiven, massiver, massierer
massivere » massiver, massive, massively

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