It is popular that many Vietnamese students feel it very difficult to speak English correctly and fluently eventhough they can read and write pretty well.
Here comes solutions and some tips for you.
Besides, speaking and listening to English becomes extremely easy and simple if you spend your time on watching films, TV shows or following bloggers´video, clips whatever you feel interested in everyday. You can also sing songs you love and imitate how they sing.
Eventually, you cannot, first, understand anything but then gradually and automatically you improve your skills since when you do not know.
Please keep in mind: listening to whatever you like, imitating how they speak, speaking out loud and getting your goal.