As was the case with China, and thanks to the dissemination of “new books” introducing reform or revolutionary ideas, intellectuals in Vietnam as well as in Korea also started to look to the outside world to help them reconsider their own land. This paper analyzes the case in Vietnam, where this movement was particularly effective. To understand the Vietnamese case, one should explore first a social phenomenon represented by a silent shout: the creeping dissemination of Chinese revolutionary “new books” and leaders into Vietnamese society. And then, the probable connections between the shout and an epidemic of revolution in Vietnam in the early twentieth century should be revealed through the analysis of the geographical and human factors that played a role in leading Vietnamese intellectuals to cooperate with outside revolutionary force.