Perhaps you should try some spelling variations:
passiver » passive, passiven, passively
passiveren » passiveen, passivenen, passivelyen, passivieren, passieren, passiven, massiveren, passivierenn, passiviertn
passivere » passivee, passivene, passivelye, massivere, passivieren, passiviert
passiverer » passiveer, passivener, passivelyer, massiverer, passivierenr, passiviertr, passiverwerb, passivieren, passieren

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