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