Perhaps you should try some spelling variations:
krebsforschung progr » krebsforschung from, krebsforschung der, krebsforschung vom
krebsforschung uber » krebsforschung der, krebsforschung die, krebsforschung und
2c fortschritte » 2 fortschritte, 23 fortschritte, 24 fortschritte
pre cancer » care cancer
le cancer » e cancer, male cancer
arts dans » art dans, arts dance, faits dans
a8s dans » ans dans, ames dans, bas dans

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 uber))%c3%((a8s dans) OR (arts 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%2c fortschritte der ((krebsforschung progr) or (krebsforschung uber))%c3%((a8s dans) OR (arts 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%2c fortschritte der ((krebsforschung progr) or (krebsforschung uber))%c3%((a8s dans) OR (arts dans)) les ((recherches sur) or (recherche sur)) ((le cancer) or (pre cancer))%22*.