Hello Nguyen Khanh Duy,
Thank you for posting in Q&A forum.
We recommend that you contact the owner of the font, Monotype Corporation, as Arial fonts are not open source or public domain fonts and are copyrighted by Monotype Corporation. We include Arial fonts on Windows for the convenience of users in their daily non-commercial activities, but this does not mean that you can use it in any commercial project for free.
For your information: Can Arial Font Be Used for Commercial Use? - All Free Mockups, Microsoft Typography & Licensing | Fonts.com
I hope the information above is helpful.
If you have any questions or concerns, please feel free to let us know.
Best Regards,
Yanhong Liu
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