Buddhism Zen Buddhism is divided into two main schools: Rinzai (臨済宗) and Sōtō (曹洞宗), the former greatly favouring the use in meditation on the koan (公案, a meditative riddle or puzzle) as a device for spiritual break-through, and the latter (while certainly employing koans) focusing more on "shikantaza" or "just sitting". Zen Buddhism is primarily found in Japan, with some presence in South Korea and Vietnam. The scholars of Japanese Soto Zen tradition in recent times have critiqued the mainstream Japanese Buddhism for "dhatu-vada", that is assuming things have substantiality, a view they assert to be non-Buddhist and "out of tune
Buddhism in Vietnam not been recognized by the government; however, in 2007, with 1.5 million followers, the Vietnamese Pure Land Buddhism Association (Tịnh Độ Cư Sĩ Phật Hội Việt Nam) received official recognition as an independent and legal religious organization. Thiền is the Sino-Xenic pronunciation of "Chan" (Japanese "Zen") and is derived ultimately from Sanskrit "dhyāna". The traditional account is that in 580, an Indian monk named Vinitaruci () traveled to Vietnam after completing his studies with Sengcan, the third patriarch of Chan Buddhism. This would be the first appearance of Thiền. The sect that Vinitaruci and his lone Vietnamese disciple founded would