Finally it works. I have decided to switch to nginx and with only few tweaks, I can now run on 80 port, the default port of nginx.
Here is the simple code to do that on etc/nginx/nginx.conf
server {
listen 80;
server_name bloggervietnam.com www.bloggervietnam.com;
location / {
proxy_pass http://127.0.0.1:8080;
}
Remember to put this code inside http tag otherwise it will cause error. You can check nginx configuration by typing : nginx -t and then restart nginx. It works!