Teerasil Dangda reduced the margin with a late strike for Thailand, who are at the bottom having lost all their three matches so far.
In another Group B match, Lebanon drew Kuwait 1-1.
Boaz Solossa's thunderous equaliser rocked China's bid to reach an 11th straight Asian Cup when they were held to a 1-1 draw by Indonesia.
China, under caretaker manager Fu Bo after Juan Antonio Camacho was sacked in June, went ahead through Wu Xi in the first half at Jakarta's cavernous Gelora Bung Karno Stadium.
But Solossa's strike from the edge of the box denied China a valuable win as Saudi Arabia continued to lead Group C with nine points after recording their third straight victory, against Iraq, in Amman later Tuesday.
The Saudis won 2-0 thanks to goals in either half from Osama Haousawi and Nasser al-Shamrani, a result that dented former champions Iraq's chances of qualifying. It was Iraq's second defeat in three matches.
Elsewhere, Singapore got their first points with a 2-1 win over war-torn Syria, which lifts them off the bottom of Group A as they seek to reach the 2015 Asian Cup in Australia.
At Singapore's Jalan Besar Stadium, striker Khairul Amri put the home side ahead after half-time when Hafiz Sujad cut in and crossed for an easy scoring opportunity.
And Gabriel Quak, moments after coming on, had the home crowd in raptures when he burst into the box from the right and planted his shot for a 2-0 lead in the 81st minute.
Reja Rafe's raking strike with two minutes to go gave Syria hope, but Singapore held on for what were their first points of qualifying.
Oman continue to lead the group after a goalless draw with Jordan in Amman.
In Hong Kong, Ali Ahmed Mabkhout scored a hat-trick as Group E leaders United Arab Emirates maintained their 100 percent record with a 4-0 away thrashing of Hong Kong.
Before Tuesday's game, Hong Kong were second in Group E behind UAE, but they were brought down to earth by their big 4-0 defeat to the pool leaders at home.
Mabkhout sent the visitors on their way on the half-hour, and he added two more in the second period before Walid Abbas grabbed UAE's fourth deep in injury time.
In Group D, Singapore's neighbours Malaysia rescued a point against Bahrain when Norshahrul Idlan Talaha scored in the 71stminute for a 1-1 draw in Shah Alam.
Malaysia, co-hosts of the Asian Cup in 2007, stay third in the group. The top two teams in each of five groups win berths in Australia, as well as the best third-placed side.
Group D also saw action on Sunday when Qatar thrashed Yemen 6-0 with Khalfan Ibrahim scoring a hat-trick. Hassan al-Haydos, Sebastian Soria and Hassan Ali Afif completed the rout.
The next round of the matches will be played on November 15.