Perhaps you should try some spelling variations:
passiver » passiven, passively, passiert
passivere » passivene, passivelye, passierte, passiverer, massivere, passivieren
passivelyer » passively, passiverer, passiverwerb
massiveren » massivere, massigeren, massivement

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 (passive OR (passivere OR passivelyer))) OR (massive OR massiveren)).
• Adding a wildcard symbol may retrieve word variants: ((passiver or (passive or (passivere or passivelyer))) or (massive or massiveren))*.