Phan Bội Châu became a teaching text at the Tonkin Free School in Hanoi, a school run by Phan's contemporaries to promote the independence movement. However, Phan did not receive much of a reaction in terms of aid towards his independence efforts, since the book made Chinese readers worry about their own future. The book had a much better reception among Vietnamese readers. Phan and a colleague, Đặng Tử Kính, left Japan for the first time in August 1905, carrying 50 copies of the book that were to distributed throughout Vietnam, of which further copies were made inside the country. Phan's direct writing
Phu Phan Mountains Kaen, Nong Bua Lamphu, Udon Thani, Sakon Nakhon, Nakhon Phanom, Kalasin, Roi Et, Maha Sarakham, and Mukdahan Province. The highest elevation of the Phu Phan Range is the 641 m high summit known as Phu Lang Ka. It is in Nakhon Phanom Province. Other important peaks are 624 m high Phu Mai Hia in Mukdahan Province and the 563 m high summit known as Phu Langka Nuea in Nakhon Phanom Province. The hills are mostly deforested, although patches covered with mixed deciduous forest remain in zones spread across the range. Phu Phan Royal Palace is in the area, as is