Perhaps you should try some spelling variations:
krebsforschung uber » krebsforschung die, krebsforschung und, grossforschung uber
krebsforschung der » krebsforschung die, krebsforschung das, krebsforschung zur
5 fortschritte » ii fortschritte, die fortschritte, und fortschritte
c fortschritte » 2 fortschritte, 3 fortschritte, 4 fortschritte
pre cancer » care cancer
le cancer » e cancer, male 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%((c fortschritte) OR (5 fortschritte)) der ((krebsforschung der) OR (krebsforschung uber))%c3%a8s dans les ((recherches sur) OR (recherche sur)) ((le cancer) OR (pre cancer))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%recent results in cancer research%((c fortschritte) OR (5 fortschritte)) der ((krebsforschung der) or (krebsforschung uber))%c3%a8s dans les ((recherches sur) or (recherche sur)) ((le cancer) or (pre cancer))%22".
• Adding a wildcard symbol may retrieve word variants: %recent results in cancer research%((c fortschritte) OR (5 fortschritte)) der ((krebsforschung der) or (krebsforschung uber))%c3%a8s dans les ((recherches sur) or (recherche sur)) ((le cancer) or (pre cancer))%22*.