Tinhvan Outsourcing (TVO) has been and continues to be a great partner for QuadralinkGlobal Services
We have always been impressed at the quality of people that Tinhvan has been able to provide us.  They have and will continue to be an integral part in successfully transforming our North American clients' needs into reality. 
We would definitely recommend TVO to any company seeking a development partner with the highest level of professionalism, consistency and reliability.