Update 2.31

Update 2.31

https://drive.google.com/file/d/0B-ZKEn57g3V0bXlBejNBR1AyZEk/view?usp=sharing

Patch dành cho ai đã dow 2.30
https://drive.google.com/file/d/0B-ZKEn57g3V0U2ZyT1JjdHdwS2c/view?usp=sharing