Perhaps you should try some spelling variations:
krebsforschung progr » krebsforschung from, krebsforschung uber, krebsforschung vom
krebsforschung der » krebsforschung uber, krebsforschung die, krebsforschung das
recents results » recent results, recents resultats, events results
23 fortschritte » 2 fortschritte, 24 fortschritte, 25 fortschritte
recent result » recent results, resent results, present results
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 result) OR (recents results)) in cancer research%23 fortschritte der ((krebsforschung progr) OR (krebsforschung der))%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 result) OR (recents results)) in cancer research%23 fortschritte der ((krebsforschung progr) or (krebsforschung der))%c3%a8s dans les ((recherches sur) or (recherche sur)) ((le cancer) or (pre cancer))%22".
• Adding a wildcard symbol may retrieve word variants: %((recent result) OR (recents results)) in cancer research%23 fortschritte der ((krebsforschung progr) or (krebsforschung der))%c3%a8s dans les ((recherches sur) or (recherche sur)) ((le cancer) or (pre cancer))%22*.