Perhaps you should try some spelling variations:
krebsforschung der » krebsforschung uber, krebsforschung die, krebsforschung das
2c fortschritte » 23 fortschritte, 24 fortschritte, 25 fortschritte
2 fortschritte » 23 fortschritte, 24 fortschritte, 25 fortschritte
les recherches » des recherches
de recherches » des recherches, de recherche
does cancer » modes cancer, nodes cancer, does cantor
les cancers » liver cancers, neck cancers, lung cancers
les cancer » lines cancer, gets cancer, cns cancer
a8s dans » ans dans, arts dans, ames dans

Try widening your search to All Fields.

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: %recent results in cancer research%((2c fortschritte) OR (2 fortschritte)) der krebsforschung der%c3%a8s dans ((les recherches) OR (de recherches)) sur ((((les cancer) OR (les cancers))) OR (does cancer))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%recent results in cancer research%((2c fortschritte) or (2 fortschritte)) der krebsforschung der%c3%a8s dans ((les recherches) or (de recherches)) sur ((((les cancer) OR (les cancers))) or (does cancer))%22".
• Adding a wildcard symbol may retrieve word variants: %recent results in cancer research%((2c fortschritte) or (2 fortschritte)) der krebsforschung der%c3%a8s dans ((les recherches) or (de recherches)) sur ((((les cancer) OR (les cancers))) or (does cancer))%22*.