The young midfielder joined a Thai Premier League club, BEC Tero Sasana in a 2001-2002 season and eventually won the league title with the club at the end of the season. It was his first senior silverware. After a successful season with BEC Tero Sasana, Datsakorn was given a chance to play for a Bundesliga club, 1. FC Kaiserslautern on a season loan deal. On 2002, May 2 1. FC Kaiserslautern expressed their interest in permanently signing Datsakorn, which also was the skipper of Thailand U-20 at the moment. However, it was reported that Datsakorn refused to extend his contract with the German side as he was homesick. Datsakorn returned to BEC Tero Sasana in the next season 2002-2003 and led the team to AFC Champions League final but lost to UAE's Al Ain 1-2 on aggregate. The same season he also awarded only runners-up in another 3 competitions ASEAN Club Championship, Kor Royal Cup and Thai Premier League.
In 2007, the Thai playmaker joined a Vietnamese club, Hoàng Anh Gia Lai. He later became one of the Vietnamese supporters' favorites after two years with Hoàng Anh Gia Lai, although he could not help the club win any silverware.
In 2010, Thai Premier League champion, Muangthong United signed Datsakorn back to Thailand for a reported fee of $200,000. It was speculated that, due to the deal, he became the Thailand's highest paid footballer at the moment. He settled into the 2009 Thai Premier League champions quickly and became a key member of the team. Datsakorn was also appointed as captain later. He helped the team secured Thai League T1 title 2010 and 2012 and 2016.
International career
Datsakorn made his debut in Thailand national team in 2001 while he was spending his loan spell at Kaiserslautern. He was first called up for U-19 and U-23 squad for a short period but became a regular member of senior squad soon afterward. Datsakorn has been featuring in Thailand national team from 2001 to 2014, made to total appearances of 98 and scored 11 goals. He was criticized in his early years with the national team for his violent behavior, which led him to several sending-offs. against Oman in 2011 In 2007, Thonglao played again in FIFA World Cup qualification. He scored 2 goals for Thailand in the match against Macau national football team in qualification first round and 1 goal in the match again Bahrain national football team 1-1 in qualification third round. Thonglao was also a member of the victorious T&T Cup 2008 winning squad. In 2011, Thonglao played in FIFA World Cup qualification. He goals for Thailand 2 goals in the 2-2 draw against Palestine national football team in the second round. In 2012, he was called to almost every tournament in the national team. He was a key player in the 2012 AFF Suzuki Cup he suffered a groin injury, but had managed play until the end of the tournament. In October 2017 he was called to play with the Kenya national football team, After the match Datsakorn was celebrate for his 100 international appearances with Thailand national football team.
