Perhaps you should try some spelling variations:
praktische biochemie » praktische chemie, exotische biochemien, klinische biochemie
philippa cohen » philipp hohn
phillips cohen » phillips john, phillips colin, phillips ahn

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: "((philippa cohen) OR (phillips cohen)) (praktische biochemie)*".