Perhaps you should try some spelling variations:
passiv » massiv, passiver
passive » massive, passivere
passivene » massivene, passiverene, passiveand, passively, passiver, passione
passiven » massiven, passiveren, passion
passiverer » massiverer, passivererer, passiverwerb, passivieren, passiver
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 (passive OR ((passivene OR passiven) OR (passiverer OR massiverer)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(passiv or (passive or ((passivene OR passiven) or (passiverer or massiverer))))".
• Adding a wildcard symbol may retrieve word variants: (passiv or (passive or ((passivene OR passiven) or (passiverer or massiverer))))*.