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