Perhaps you should try some spelling variations:
ruhr » ruhe (Expand Search), nuhr (Expand Search), rohr (Expand Search)
mohr » mehr (Expand Search), lohr (Expand Search), moor (Expand Search)
mohn » mahn (Expand Search), mohne (Expand Search)
ohn » ohne (Expand Search)
bohn » bohne (Expand Search)
john » johne (Expand Search), joh (Expand Search)
hohn » hohne (Expand Search), hahn (Expand Search), huhn (Expand Search)
sohn » sohne (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 ((mohn OR (ohn OR bohn)) OR john)) OR (hohn OR sohn))) university bochum~".
• Adding a wildcard symbol may retrieve word variants: (ruhr OR ((mohr OR ((mohn OR (ohn OR bohn)) OR john)) OR (hohn OR sohn))) university bochum*.