Perhaps you should try some spelling variations:
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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("recent results in cancer research, fortschritte der krebsforschung from dans les recherches four lines cancer") OR ("recent results in cancer research, fortschritte der krebsforschung from dans de recherches four lines cancer"))) OR ("recent results in cancer research, fortschritte der krebsforschung from dans les recherches hour lines cancer")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"recent results in cancer research, fortschritte der krebsforschung from dans les recherches four lines cancer\") OR (\"recent results in cancer research, fortschritte der krebsforschung from dans de recherches four lines cancer\"))) or (\"recent results in cancer research, fortschritte der krebsforschung from dans les recherches hour lines cancer\"))".
• Removing quotes may allow a broader search: (((( recent results in cancer research, fortschritte der krebsforschung from dans les recherches four lines cancer ) OR ( recent results in cancer research, fortschritte der krebsforschung from dans de recherches four lines cancer ))) or ( recent results in cancer research, fortschritte der krebsforschung from dans les recherches hour lines cancer )).
• Adding a wildcard symbol may retrieve word variants: (((("recent results in cancer research, fortschritte der krebsforschung from dans les recherches four lines cancer") OR ("recent results in cancer research, fortschritte der krebsforschung from dans de recherches four lines cancer"))) or ("recent results in cancer research, fortschritte der krebsforschung from dans les recherches hour lines cancer"))*.