Perhaps you should try some spelling variations:
krebsforschung und » krebsforschung _, krebsforschung die, krebsforschung heute
present results » recent results, treatment results
2c fortschritte » 2 fortschritte, 23 fortschritte, 24 fortschritte
les recherches » des recherches, de recherches
a8s dans » ans dans, arts dans, ames dans
sur does » four does, star does, user does

Try widening your search to All Fields.

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: "%present results in cancer research%2c fortschritte der krebsforschung und%c3%a8s dans les recherches ((sur does) OR (sur des)) cancer%22".
• Adding a wildcard symbol may retrieve word variants: %present results in cancer research%2c fortschritte der krebsforschung und%c3%a8s dans les recherches ((sur does) OR (sur des)) cancer%22*.