The site in question is not a 100% clone since some pages have been altered, it looks like the site is being worked on and the copyrighted images may be removed once they have the site finished but with this said its still possible to claim ownership of the design.
Your first action should be identifying who owns the domain, me being bored I've decided to do that for you. Standard domain whois services will not work on .vn domains and you need to go to the authority .vn regulator which in this case is VNNIC. The public records for the domain owner in question is:
- Name: Ông Dương Vĩnh Trung
- Address: 59/11 Nguyễn Bỉnh Khiêm, ĐaKao, Quận 1, TP HCM
This is some what different than what they claim on the website but here's the contact information using the data on their website:
- Address: 82-84 Lê Quang Định, P14, Q. Bình Thạnh, TPHCM.
- Phone: 08 38410945 - 093.949.1693 - 0120.7667.888
- Fax: 08 38410946
- Email: info@true-x.net
Now you have this information there is so many routes you can take, personally you should seek professional legal advice and have lawyers send out letters to the addresses in question, and where they go from there is depends on the response, if any.
Alternatively you could try first contact yourself as well as seeking help from Google, you can send a email to info@true-x.net with a take down notice threatening legal action. Also it may be possible to remove their site from search results on Google using a DMCA take down. It's important to note that not all copyrights apply in all countries and vary, this is another reason why you should seek legal advice.