Perhaps you should try some spelling variations:
krebsforschung progres » krebsforschung from
progres dans » progres des, progres de
pre cancer » care cancer
le cancer » e cancer, male cancer

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 dans les ((recherches sur) OR (recherche sur)) ((le cancer) OR (pre cancer)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "recent results in cancer research, fortschritte der krebsforschung progres dans les ((recherches sur) OR (recherche sur)) ((le cancer) or (pre cancer))".
• Adding a wildcard symbol may retrieve word variants: recent results in cancer research, fortschritte der krebsforschung progres dans les ((recherches sur) OR (recherche sur)) ((le cancer) or (pre cancer))*.