Perhaps you should try some spelling variations:
"internationales steuerrecht" » "internationales strafrecht", "internationales privatrecht", "internationales recht"
"internationales sportrecht" » "internationales strafrecht", "internationales privatrecht", "internationales umweltrecht"

Try widening your search to All Fields.

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"internationales sportrecht\") OR (\"internationales steuerrecht\"))".
• Removing quotes may allow a broader search: (( internationales sportrecht ) OR ( internationales steuerrecht )).
• Adding a wildcard symbol may retrieve word variants: (("internationales sportrecht") OR ("internationales steuerrecht"))*.