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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 progres des les recherches sur le cancer") OR ("recent results in cancer research, fortschritte der krebsforschung progres des leh recherches your pre cancer"))) OR ("recent results in cancer research, fortschritte der krebsforschung progres des les recherches sur male cancer")).
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• Adding a wildcard symbol may retrieve word variants: (((("recent results in cancer research, fortschritte der krebsforschung progres des les recherches sur le cancer") or ("recent results in cancer research, fortschritte der krebsforschung progres des leh recherches your pre cancer"))) or ("recent results in cancer research, fortschritte der krebsforschung progres des les recherches sur male cancer"))*.