Perhaps you should try some spelling variations:
krebsforschung der » krebsforschung uber, krebsforschung die, krebsforschung das
2c fortschritte » 2 fortschritte, 23 fortschritte, 24 fortschritte
les recherches » de recherches
model cancer » models cancer, modern cancer, bowel cancer
modes cancer » models cancer, nodes cancer, modern cancer
does cancer » nodes cancer, does cantor, echoes cancer
a8s dans » arts dans, ames dans, bas 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 der%c3%((a8s dans) OR (ans dans)) ((les recherches) OR (des recherches)) sur ((does cancer) OR (((modes cancer) OR (model 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%c3%((a8s dans) or (ans dans)) ((les recherches) or (des recherches)) sur ((does cancer) or (((modes cancer) OR (model cancer))))%22".
• Adding a wildcard symbol may retrieve word variants: %recent results in cancer research%2c fortschritte der krebsforschung der%c3%((a8s dans) or (ans dans)) ((les recherches) or (des recherches)) sur ((does cancer) or (((modes cancer) OR (model cancer))))%22*.