Perhaps you should try some spelling variations:
krebsforschung der » krebsforschung uber, krebsforschung die, krebsforschung das
23 fortschritte » 2 fortschritte, 24 fortschritte, 25 fortschritte
2c fortschritte » 2 fortschritte, 24 fortschritte, 25 fortschritte
les recherches » des recherches
de recherches » des recherches, de recherche
lines cancer » linear cancer, linked cancer, lungs cancer
les cancer » les cancers, does cancer, gets cancer
dans » das, dass

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 (23 fortschritte)) der krebsforschung der%c3%ans dans ((les recherches) OR (de recherches)) sur ((les cancer) OR (lines cancer))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%recent results in cancer research%((2c fortschritte) OR (23 fortschritte)) der krebsforschung der%c3%ans dans ((les recherches) or (de recherches)) sur ((les cancer) or (lines cancer))%22".
• Adding a wildcard symbol may retrieve word variants: %recent results in cancer research%((2c fortschritte) OR (23 fortschritte)) der krebsforschung der%c3%ans dans ((les recherches) or (de recherches)) sur ((les cancer) or (lines cancer))%22*.