It show vietnamese have bad taste but China just do it according to vietnamese request. No fault for Chinese.
Do you know what is called inflation? Any of your mention project completed in same time as Vietnam one? And the price you quote included train and other support, land acquisition plus plus? Are you implying vietnamese are dumb?
every where in the world the cost estmation is done in same way.
Price adjustment is about more than 300 US$ has been made.
Đường sắt Cát Linh - Hà Đông đội vốn hơn 300 triệu USD - Xã hội - Zing.vn