Perhaps you should try some spelling variations:
passiv » passiven
passiver » passivener, passiven, passiert
passively » passivenely, massively, passivity, passiven
passive » passivene
massiv » massive
massiven » massiveen, 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 passiver) OR massiv) OR (passively OR passive)) OR massiven).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((passiv OR passiver) or massiv) or (passively or passive)) or massiven)".
• Adding a wildcard symbol may retrieve word variants: ((((passiv OR passiver) or massiv) or (passively or passive)) or massiven)*.