[1] Quang Hải was promoted to the Khánh Hòa first team in 2004 after 3 years of training in the province's football talent class.

[3] In the middle of the 2007 V-League season, when Hoang Anh Tuan became the head coach of the team, Quang Hai's training efforts finally paid off.

[4] e played more regularly and also scored the decisive goal in the match against Hanoi ACB that year to help Khatoco Khanh Hoa successfully stay in the top flight.

[5][6] In 2007, Quang Hai was also part of the Khatoco Khanh Hoa U-21 team that won the National U-21 Football Championship for the first time.

[19] On May 14, 2009, he scored another late goal in a 1-0 friendly win against Olympiacos F.C., then coached by Ernesto Valverde, but it wasn't an official FIFA international match.