Goals either side of half-time from Adisak Kraisorn and Theeraton Bunmathan ensured Buriram sent the home fans happy at The Thunder Castle Stadium and kept them on course for the title.
Buriram have now won five consecutive games in the league, as they look to fend off the challenge posed by Muang Thong United.
Edivaldo put Muang Thong ahead in the 21st minute and they sealed all three points when Teerasil Dangda struck with just three minutes remaining, even though Kanokphol scored an injury-time consolation for the visitors.
At the other end of the table, Chiangrai United's survival hopes were dealt another blow after they suffered a heavy 3-0 defeat at home to Osotspa.
Henk Wisman's charges have now failed to register a win in their last six games, as goals from Kabfah Boonmatoon, Anthony Moura and Chananan Pombuppha consigned them to their fourth defeat in their last five outings.
Despite the comfortable final scoreline, Phayong Khunnaen's men left it late to put the game beyond doubt.
