Perhaps you should try some spelling variations:
"radioaktive kontamination" » "radioactive contamination", "radioaktiver kontaminationen", "radioactive contaminations"
"radioactive continuation" » "radioactive contamination", "radioactive contaminations", "radioactive decontamination"

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: (("radioactive continuation") OR ("radioaktive kontamination"))*.
• Removing quotes may allow a broader search: (( radioactive continuation ) or ( radioaktive kontamination ))*.