For your question, we would like to have below suggestion:
The list of banned export and import goods in general and list of prohibited or restricted goods by mail in particularly include various commodities. You should refer these documents for getting more detail information:
- List of prohibited import/export goods issued enclose with the Decree no.12/2006/ND-CP dated 23/01/2006 of the Government detailing implementation of Trade Law regulations on international buying and selling of commodities and agent activities including purchasing, selling, sourcing, outsourcing, border-gate transfer, and transiting of commodities with foreign countries.You can find above informations at Vietnam customs website through this link http://www.customs.gov.vn/English/Lists/SupportOnline/ViewAnswer.aspx?List=9b4e0dff-5f8b-4e6d-a758-0462aa7db68f&ID=1128
- List of prohibited export and import goods by mail: Vietnam Post and Telecommunications company at portal www.vnpost.vn => Service => Support customers => List of goods banned.