Perhaps you should try some spelling variations:
krebsforschung progr » krebsforschung der, krebsforschung vom, krebsforschung zur
krebsforschung from » krebsforschung vom, krebsforschung beim, krebsforschung _
krebsforschung uber » krebsforschung der, krebsforschung die, krebsforschung und
2c fortschritte » 2 fortschritte, 23 fortschritte, 24 fortschritte
care cancer » male cancer, cancer cancer
e cancer » le cancer, pre 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 progr) OR (krebsforschung from))) OR (krebsforschung uber))%c3%a8s dans les ((recherches sur) OR (recherche sur)) ((e cancer) OR (care cancer))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%recent results in cancer research%2c fortschritte der ((((krebsforschung progr) OR (krebsforschung from))) or (krebsforschung uber))%c3%a8s dans les ((recherches sur) or (recherche sur)) ((e cancer) or (care cancer))%22".
• Adding a wildcard symbol may retrieve word variants: %recent results in cancer research%2c fortschritte der ((((krebsforschung progr) OR (krebsforschung from))) or (krebsforschung uber))%c3%a8s dans les ((recherches sur) or (recherche sur)) ((e cancer) or (care cancer))%22*.