Perhaps you should try some spelling variations:
"ruhr universitat bochum" » "der universitat bochum" (Expand Search)
"ruhr universitat bonn" » "der universitat bonn" (Expand Search), "ruhr universitat berlin" (Expand Search), "ruhr universitat zu" (Expand Search), "ruhr universitat _" (Expand Search)
"ruhr universitat wien" » "der universitat wien" (Expand Search), "ruhr universitat kiel" (Expand Search), "ruhr universitat zu" (Expand Search), "ruhr universitat _" (Expand Search)

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("ruhr universitat bochum") OR ((("ruhr universitat bonn") OR ("ruhr universitat wien"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"ruhr universitat bochum\") OR (((\"ruhr universitat bonn\") OR (\"ruhr universitat wien\"))))*".
• Removing quotes may allow a broader search: (( ruhr universitat bochum ) OR ((( ruhr universitat bonn ) OR ( ruhr universitat wien ))))*.