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