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