Perhaps you should try some spelling variations:
passiv » massiv, passiven
passiver » massiver, passivener, passiven, passively, passiert
passive » massive, passivene
passiverer » massiverer, passivenerer, passivener, passivelyer, passierter, passiverwerb, passivieren, passieren
massiverer » massivere, massierer, massiver

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