Perhaps you should try some spelling variations:
internationales umweltrecht » internationales arbeitsrecht, internationales privatrecht, internationales recht
internationales strafrecht » internationales privatrecht

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: ((internationales strafrecht) OR (internationales umweltrecht)).
• Adding a wildcard symbol may retrieve word variants: ((internationales strafrecht) or (internationales umweltrecht))*.