Language varieties closely related to or part of Kam include Cao Miao and Naxi Yao.
In Suining County, Hunan, Dong is spoken in Lianfeng 联丰 (including Duolong 多龙村), Huangsangping 黄桑坪, Le'anpu 乐安铺, and other nearby locations.
[6] In Chengbu County, Hunan, Dong is spoken in Yanzhai 岩寨, Chang'anying 长安营, and Jiangtousi 江头司.
The Kam variety spoken in Đồng Mộc is most similar to that of Lípíng Shuǐkǒu (黎平县水口镇) in southeastern Guizhou.
Chen Qiguang (2013:39)[10] reports that the ancestors of Naxihua 那溪话 speakers had migrated to their current location from Tianzhu, Liping, and Yuping counties of southeastern Guizhou during the early 15th century.
The Ngo Van Lyong system was inspired by the Vietnamese alphabet and is made for speakers and learners.
As with the Hmong alphabet, the Chinese orthography marks tones with a consonant at the end of each syllable.