Perhaps you should try some spelling variations:
krebsforschung from » krebsforschung vom, krebsforschung beim, krebsforschung _
recherches sur » recherche sur
get cancer » gets cancer, gut cancer, gist cancer
et cancer » ent cancer, vt cancer, lent cancer
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 ((de de) OR (de ce)) recherches sur ((et cancer) OR (get cancer)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "recent results in cancer research, fortschritte der krebsforschung from ((de de) or (de ce)) recherches sur ((et cancer) OR (get cancer))".
• Adding a wildcard symbol may retrieve word variants: recent results in cancer research, fortschritte der krebsforschung from ((de de) or (de ce)) recherches sur ((et cancer) OR (get cancer))*.