Perhaps you should try some spelling variations:
passiven » passive, passion
massiv » massive
massiven » massiveen, massive
massively » massiveely, massive
passivieren » passivierende, passivierung, passieren

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: ((passiven OR massiv) OR ((massiven OR massively) OR passivieren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((passiven or massiv) or ((massiven OR massively) or passivieren))*".