just read it and learn from the others. you can only learn and study. don't measure the time because learning a language is not easy and will take a lot of time depend of your studying... so good luck!

if you want to learning vietnamese . contact with we on skype :giacatluong21593 i can teach you everything

为什么想学越南话呢

应该不难

Since you are a Chinese, there are many advantages for you in learning Vietnamese because our culture have a lot of things in common. To be fluent at daily communication, I think it's not too hard if you have the environment to practise speaking every day. In this case, maybe learn by heart is the fastest way and how long it will take to learn is depended on how many sentences you can remember per day. If there is something that I can help, feel free to contact me.