Perhaps you should try some spelling variations:
passiv » massiv
passiver » massiver, passively, passiert
passiven » massiven, passion
passivener » massivener, passioner, passiverer, passiverwerb
passive » massive
passioner » passione, passionen, massioner

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