Perhaps you should try some spelling variations:
krebsforschung die » krebsforschung _
krebsforschung und » krebsforschung _, praxisforschung und, friedensforschung und
2c fortschritte » 2 fortschritte, 23 fortschritte, 24 fortschritte
les recherches » des recherches, de recherches
recherches sur » recherche sur
does cancer » modes cancer, nodes cancer, does cantor
les cancer » les cancers, lines cancer, gets 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 der ((((krebsforschung die) OR (krebsforschung und))) OR (krebsforschung heute))%c3%a8s dans les recherches sur ((les cancer) OR (does cancer))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%recent results in cancer research%2c fortschritte der ((((krebsforschung die) OR (krebsforschung und))) or (krebsforschung heute))%c3%a8s dans les recherches sur ((les cancer) or (does cancer))%22".
• Adding a wildcard symbol may retrieve word variants: %recent results in cancer research%2c fortschritte der ((((krebsforschung die) OR (krebsforschung und))) or (krebsforschung heute))%c3%a8s dans les recherches sur ((les cancer) or (does cancer))%22*.