Perhaps you should try some spelling variations:
universitat bonn » universitat wien (Expand Search), universitat berlin (Expand Search), universitat zu (Expand Search)
ruhr » ruhe (Expand Search), nuhr (Expand Search), rohr (Expand Search)
mohn » hohn (Expand Search), bohn (Expand Search), john (Expand Search), mohne (Expand Search), mhohn (Expand Search), mbohn (Expand Search)
mbohnee » mbohneee (Expand Search), mbhohnee (Expand Search), mbbohnee (Expand Search)
ohn » ohne (Expand Search), hohn (Expand Search), bohn (Expand Search)
sohn » sohne (Expand Search), shohn (Expand Search), sbohn (Expand Search)
hbbohn » hbbohne (Expand Search), hbbhohn (Expand Search), hbbbohn (Expand Search)
sjjohn » sjjohne (Expand Search), sjjhohn (Expand Search), sjjbohn (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 OR ((mohn OR ((mbohnee OR ohn) OR sohn)) OR ((hbbohn OR joh) OR sjjohn))) universitat bonn~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(ruhr OR ((mohn OR ((mbohnee OR ohn) OR sohn)) OR ((hbbohn OR joh) OR sjjohn))) universitat bonn*".