Perhaps you should try some spelling variations:
passiven » passive
passivene » passivee, passive, passively, passiver
passiveren » passivieren, passieren, passiver
passiverer » passiverwerb, passivieren, passiver

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