Perhaps you should try some spelling variations:
passiven » passion
passivere » passiver, massivere, passivieren
passiverer » passiverr, massiverer, passivierenr, passiverwerb, passivieren, passiver
passiverr » passiver, passiviert, passiert

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