Perhaps you should try some spelling variations:
krebsforschung die » krebsforschung _
krebsforschung und » krebsforschung _, praxisforschung und, friedensforschung und
present results » recent results, treatment results
2c fortschritte » 2 fortschritte, 23 fortschritte, 24 fortschritte
recherches sur » recherche sur
de recherches » des recherches, de recherche
does cancer » modes cancer, nodes cancer, does cantor
a8s dans » ans dans, arts dans, ames dans
sur does » sur des, four does, star does
dans de » dans des, dans ce, dans d

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: %present results in cancer research%2c fortschritte der ((krebsforschung und) OR (((krebsforschung die) OR (krebsforschung heute))))%c3%a8s dans de recherches sur does cancer%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%present results in cancer research%2c fortschritte der ((krebsforschung und) or (((krebsforschung die) OR (krebsforschung heute))))%c3%a8s dans de recherches sur does cancer%22".
• Adding a wildcard symbol may retrieve word variants: %present results in cancer research%2c fortschritte der ((krebsforschung und) or (((krebsforschung die) OR (krebsforschung heute))))%c3%a8s dans de recherches sur does cancer%22*.