Perhaps you should try some spelling variations:
krebsforschung der » krebsforschung uber, krebsforschung das, krebsforschung zur
krebsforschung die » krebsforschung _, krebsforschung und, krebsforschung heute
2c fortschritte » 2 fortschritte, 23 fortschritte, 24 fortschritte
recherches sur » recherche sur
les recherches » des recherches, de recherches
modes cancer » models cancer, model cancer, nodes cancer
does cancer » nodes cancer, does cantor, echoes cancer
arts dans » arts dance, faits dans, prets dans
art dans » art das, mort dans, art des
a8s dans » ans dans, ames dans, ils dans

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