các nước đang phát triển 
developing countries [ các ] : (1) (pluralizer); these, various; (2) council chambers; (3) card; (4) to pay (additionally) as part of a deal
[ nước ] : country, nation, state; water, liquid (for drinking); gum(s) (flesh surrounding teeth)
[ đang ] : (present progressive marker)
[ phát ] : to distribute, send out, become; [CL for gunshots, abrupt actions]
Most Common Compounds Set 1:
Most Common Compounds Set 2 :