Phan Khôi short time. However, he also was very interested in researching the roots of Vietnamese heritage, especially Vietnamese spoken language, which had long been ignored and looked down upon by the elite class in Vietnam. His research Phan Khôi: Việt ngữ nghiên cứu was a well of knowledge for young Vietnamese to follow. One generation before Hoàng Văn Chí, one generation after Phan Chu Trinh, Phan Khôi represented a class of Vietnamese intellectuals caught between colonialism, nationalism, communism. Phan Khôi's progressive spirit and his lifelong effort to raise the Vietnamese people's awareness of human rights, civil rights, and good education were
Phu Kao–Phu Phan Kham National Park Bua Lamphu Province. The park's area is . The park's western section is located in the Phu Kao mountain range and the eastern section in the Phu Phan Kham mountain range of the Phu Phan Mountains. The park's western section is home to numerous caves hosting prehistoric rock paintings such as Tham Palan Hai, Tham Muem and Tham Rakha Khanit. Ancient artifacts of the Ban Chiang era have also been discovered in the area. The rock paintings and artifacts are estimated at more than 3,500 years old. In 1985 the park was established as Thailand's 50th national park. Part of