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