Use CloudFlare DC in Viet Nam?

Dear all,
Can you please guide me how to use Cloudflare DC in Viet Nam ( Ho Chi Minh & DC) ? I see that Cloudflare have these DCs but my clients always access our FQDN via Hong Khong to our servers which are located in Viet Nam.
Hien Huynh

This recent reply from Cloudflare staff in another similar topic is relevant to your question.