Perhaps you should try some spelling variations:
ruhr » ruhe (Expand Search), nuhr (Expand Search), rohr (Expand Search)
mohr » mehr (Expand Search), lohr (Expand Search), mohn (Expand Search)
mohne » ohne (Expand Search), sohne (Expand Search), mohn (Expand Search), mohnee (Expand Search), mhohne (Expand Search), mjohne (Expand Search)
ohn » ohne (Expand Search), hohn (Expand Search), john (Expand Search)
bohn » bohne (Expand Search), bhohn (Expand Search), bjohn (Expand Search)
sohn » sohne (Expand Search), shohn (Expand Search), sjohn (Expand Search)
university » universitat (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 ((mohne OR ohn) OR bohn)) OR (huhn OR sohn))) university bochum~".
• Adding a wildcard symbol may retrieve word variants: (ruhr OR ((mohr OR ((mohne OR ohn) OR bohn)) OR (huhn OR sohn))) university bochum*.