Perhaps you should try some spelling variations:
nippel university » kluppel university, kiel university, novel university
kohler university » moller university, goller university, kepler university
wilfried nippel » wilfried griebel, wilfried rickels
wilfried kohler » wilfried datler, wilfried muller

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( wilfried nippel university ) OR ( wilfried kohler university )).
• Adding a wildcard symbol may retrieve word variants: (( wilfried nippel university ) or ( wilfried kohler university ))*.