Southeast Asian land (4)
(Other definitions for laos that I've seen before include "South-east Asian republic, capital Vientiane" , "Indo-Chinese country" , "SE Asian country" , "Country of Indo-China, capital Vientiane" , "Republic of southeast Asia" .)
(Other definitions for thailand that I've seen before include "Country of southeastern Asia" , "Southeast Asian country" , "Country in SE Asia, capital of Bangkok" , "Former Siam" , "Modern Siam" .)