Perhaps you should try some spelling variations:
krebsforschung from » krebsforschung vom, krebsforschung beim, krebsforschung _
recherches sur » recherche sur
ce cancer » e cancer, le cancer, de cancer
de de » de se, 4e de, de le

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