BEC Tero Sasana, Muang Thong United and Army United all drew on Saturday, with Chonburi climbing to third - just one point off top spot - after beating Air Force Central 2-0 the following day.
At the other end of the table, Sisaket claimed just their fourth win of the league campaign, beating fellow strugglers Samut Songkhram 2-1 to climb out of the relegation zone.
Leaders BEC were held 1-1 at home by TOT, with Noppol Pol-udom's stoppage-time strike for the visitors cancelling out George Welcome's first-half opener.
And those two results paved the way for Chonburi, who were indebted to efforts from Anderson dos Santos and Korrakot Wiriyaudomsiri in a 2-0 victory.
Also on Sunday, Sisaket scored in either half through Sarayuth Chaikamdee's penalty and a Gorka Unda strike to move up to 14th, and Singhtarua came from two goals down to draw 2-2 at 10-man Songkhla United.
