Edu­ca­tion­al and eth­nic immer­sion pro­grams focused on minor­i­ty groups, from North­ern Laos’ mys­te­ri­ous O’Pa peo­ple to North Vietnam’s Black Lolo, Hmông, Tây and Nung clans; from cen­tral Pro­to-Indochi­nese groups, Cham, Bah­nar, Cau Maa’ and Katu to Cam­bo­dia S’Aoch, Indochina’s small­est sub-group.