Perhaps you should try some spelling variations:
"maple repetitorium, repetitorium wirtschaftswissenschaften" » "maple repetitorium, berliner wirtschaftswissenschaften", "maple repetitorium, medizin wirtschaftswissenschaften"
"1 repetitorium, warum wirtschaftswissenschaften" » "1 repetitorium, der wirtschaftswissenschaften", "1 repetitorium, fur wirtschaftswissenschaften", "1 repetitorium, schule wirtschaftswissenschaften"

Try widening your search to All Fields.

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: (("maple repetitorium, repetitorium wirtschaftswissenschaften") OR ("1 repetitorium, warum wirtschaftswissenschaften")).
• Removing quotes may allow a broader search: (( maple repetitorium, repetitorium wirtschaftswissenschaften ) or ( 1 repetitorium, warum wirtschaftswissenschaften )).
• Adding a wildcard symbol may retrieve word variants: (("maple repetitorium, repetitorium wirtschaftswissenschaften") or ("1 repetitorium, warum wirtschaftswissenschaften"))*.