Perhaps you should try some spelling variations:
passiv » passiver
passive » passivere
passivener » passiverener, passiverer, passiver, passiverwerb, passioner
passiven » passiveren, passion
massiv » massive

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