You can try VTV2 channel of Vietnam at this link: http://www.vtc.com.vn. They broadcast all the matches live from Vientiane. But the languages used, unfortunately, are only Laotian, English and Vietnamese (commentator). :)
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Laos sou sou! Việt Nam su hào! :D
In SEA Games, there is no winner or loser, only the spirit of solidarity of ASEAN peoples win our hearts.