Perhaps you should try some spelling variations:
passiv » massiv, passiven, passiver
passive » massive, passivene, passivere
passivieren » massivieren, passivenieren, passiverieren, passivierende, passivierung, passieren
massiven » massive, passiven, massively

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