Perhaps you should try some spelling variations:
krebsforschung die » krebsforschung _, krebsforschung und, krebsforschung heute
22recent results » recent results, recent result, recents results
present results » recent results, treatment results
2c fortschritte » 2 fortschritte, 23 fortschritte, 24 fortschritte
recherches sur » recherche sur
les recherches » des recherches, de recherches
liver cancers » liver cancer, other cancers
lines cancer » linear cancer, linked cancer, bites cancer
genes cancer » genetics cancer, general cancer, cells cancer
a8s dans » ans dans, arts dans, ames 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: %((22recent results) OR (present results)) in cancer research%2c fortschritte der krebsforschung die%c3%a8s dans les recherches sur ((((lines cancer) OR (genes cancer))) OR (liver cancers))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22recent results) or (present results)) in cancer research%2c fortschritte der krebsforschung die%c3%a8s dans les recherches sur ((((lines cancer) OR (genes cancer))) or (liver cancers))%22".
• Adding a wildcard symbol may retrieve word variants: %((22recent results) or (present results)) in cancer research%2c fortschritte der krebsforschung die%c3%a8s dans les recherches sur ((((lines cancer) OR (genes cancer))) or (liver cancers))%22*.