Dr.Bunna has been working in Top Manpower Co.,Ltd. from 2004 until now. Dr.Bunna earned his Doctoral Degree of Business Administration (DBA) from European University, Switzerland in 2013. He obtained a Master of Laws at University of Economics and Laws, Cambodia in 2010. In 2002, Dr. Bunna graduated from the Royal University of Phnom Penh, Cambodia and obtained Bachelor of IT Engineer.