Perhaps you should try some spelling variations:
passiver » passive, passively, passiert
massiv » massive
massiven » massiveen, massive, massively
passiven » passive, passion
massigeren » massiger, massigen, massivere

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