Perhaps you should try some spelling variations:
passiv » massiv, passiven
passive » massive, passivene
passiverer » massiverer, passivenerer, passiverwerb, passivieren, passieren, passivener, passivelyer, passierter
passiver » massiver, passivener, passiven, passively, passiert
massiver » massively, massiv, massie
massiven » passiven, 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 (passive OR massive)) OR (passiverer OR (passiver OR (massiver OR massiven)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passiv or (passive OR massive)) or (passiverer or (passiver or (massiver or massiven))))".
• Adding a wildcard symbol may retrieve word variants: ((passiv or (passive OR massive)) or (passiverer or (passiver or (massiver or massiven))))*.