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