No , Vietnamese is the official language in Vietnam , It doesn't have the language division . ok ? why do u split Vietnamese into parts ?
It's the opinion which I want to explain . For example , Korean is the official language in Korea , North and South Korea , right ? Do u think study Korean in North or South is better ? No one can give u the best answer . It's up to u and where u want to live .
Do u imagine that u speak HN Accent with " Saigonese " ? oh , really hard to listen . It's just a speaking , not a quarrel . I watched " Ga La Cuoi " in the North and when they 'd acted . Well , I can't hear anything , nothing . Speak too fast , not clearly , ..........
the same as North and South Korea or u can ask the New Zealander and Australian . They can't hear exactly and clearly when talk together :D