Perhaps you should try some spelling variations:
passiven » passive, passion
passivener » passiveer, passioner, passiver, passiverwerb
passiveer » passiver, passiviert, passive
passiverer » passiverwerb, passivieren, passiver
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: ((passiven OR ((passivener OR passiveer) OR passiverer)) OR massiv).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passiven or ((passivener OR passiveer) or passiverer)) or massiv)".
• Adding a wildcard symbol may retrieve word variants: ((passiven or ((passivener OR passiveer) or passiverer)) or massiv)*.