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