Perhaps you should try some spelling variations:
passiveren » passivieren, passieren, passiven, passivern, massiveren, passivierenn
massiveren » massivere, massigeren, massivement
passiverer » passiverwerb, passivieren, passiver, passiverr, massiverer, passivierenr
passivere » passiver, massivere, passivieren
passively » massively, passivity, passiven

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