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