Perhaps you should try some spelling variations:
"ruhr university chun" » "ruhr universitat chun", "our university chun", "luther university chun", "ruhr university china", "ruhr university ch", "ruhr university church"
"ruhr university can" » "ruhr universitat can", "our university can", "luther university can", "ruhr university case", "ruhr university c", "ruhr university ch"

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

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