Not long after returning from Central America, Hsu traveled to the Philippines and visited various rainforests in Southeast Asia. His itinerary took him to the Indonesian part of Borneo, the island of Java, and other parts of Southeast Asia.
從中美洲回來，徐仁修不久後前往菲律賓，也陸續造訪了東南亞的雨林，行程遍及印尼婆羅洲、爪哇島和中南半島等地。