Perhaps you should try some spelling variations:
passiv » massiv, passiven
passiverer » massiverer, passivenerer, passiverwerb, passivieren, passieren, passivener, passivelyer, passierter
passiver » massiver, passivener, passiven, passively, passiert
passive » massive, passivene
massivierung » passivierung, passivierungs, massierung

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