Perhaps you should try some spelling variations:
universitat bochum » universitat bonn (Expand Search)
ruhr » ruhe (Expand Search), nuhr (Expand Search), rohr (Expand Search)
mohr » lohr (Expand Search), moor (Expand Search), rohr (Expand Search)
mehr » meer (Expand Search)
mohn » sohn (Expand Search), mahn (Expand Search), ohn (Expand Search)
john » sohn (Expand Search), joh (Expand Search)
hohn » hahn (Expand Search), sohn (Expand Search), huhn (Expand Search)

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 OR (((mohr OR mehr) OR ((mohn OR john) OR bohn)) OR (hohn OR sjoh))) universitat bochum~".
• Adding a wildcard symbol may retrieve word variants: (ruhr OR (((mohr OR mehr) OR ((mohn OR john) OR bohn)) OR (hohn OR sjoh))) universitat bochum*.