Perhaps you should try some spelling variations:
krebsforschung from » krebsforschung vom, krebsforschung beim, krebsforschung die
recherches sur » recherche sur
et cancer » ent cancer, get cancer, vt cancer
sur et » sur cet
de de » de re, de se, 4e de

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 _)) ((de de) OR (de ce)) recherches sur et 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 _)) ((de de) or (de ce)) recherches sur et cancer".
• Adding a wildcard symbol may retrieve word variants: recent results in cancer research, fortschritte der ((krebsforschung from) OR (krebsforschung _)) ((de de) or (de ce)) recherches sur et cancer*.