Perhaps you should try some spelling variations:
passiven » passive, passion
passivene » passivee, passione, passive, passiver
passives » passive, passiver, passions
passiverer » passiverwerb, passivieren, passiver
passively » massively, passive, passivity

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 passives) OR passiverer) OR passively) OR passiveand)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(passiven or ((((passivene OR passives) or passiverer) or passively) or passiveand))".
• Adding a wildcard symbol may retrieve word variants: (passiven or ((((passivene OR passives) or passiverer) or passively) or passiveand))*.