Perhaps you should try some spelling variations:
krebsforschung progres » krebsforschung from
les recherches » des recherches, de recherches
recherches sur » recherche sur
pre cancer » care cancer
le cancer » e cancer, male cancer
des les » des le, des lec, des leh

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 in cancer research, fortschritte der krebsforschung progres des les recherches sur ((le cancer) OR (pre cancer)).
• Adding a wildcard symbol may retrieve word variants: recent results in cancer research, fortschritte der krebsforschung progres des les recherches sur ((le cancer) or (pre cancer))*.