Perhaps you should try some spelling variations:
passiver » passiven, passively, passiert
passivere » passivene, passivelye, passierte, massivere, passivieren, passiviert
passiverer » passivener, passivelyer, passierter, massiverer, passivierenr, passiviertr, passiverwerb, passivieren, passieren
massiven » massive, passiven, massively
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 passiverer))) OR (massiven OR massiveren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passiver or (passive or (passivere OR passiverer))) or (massiven or massiveren))".
• Adding a wildcard symbol may retrieve word variants: ((passiver or (passive or (passivere OR passiverer))) or (massiven or massiveren))*.