Perhaps you should try some spelling variations:
krebsforschung from » krebsforschung vom, krebsforschung beim, krebsforschung die
recherches spur » recherches sur, recherches pour, rechereches sur
les recherches » des recherches, de recherches
linear cancer » linear channel, linear concept, linear changes
lines cancer » linked cancer, lungs cancer, genes cancer
demand les » demande les, demand led, demand last

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 from) OR (krebsforschung _)) demand les recherches spur ((lines cancer) OR (linear cancer)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "recent results in cancer research, fortschritte der ((krebsforschung from) or (krebsforschung _)) demand les recherches spur ((lines cancer) OR (linear cancer))".
• Adding a wildcard symbol may retrieve word variants: recent results in cancer research, fortschritte der ((krebsforschung from) or (krebsforschung _)) demand les recherches spur ((lines cancer) OR (linear cancer))*.