Here are some contacts for officially accessing datasets:
When I last requested data in October 2024, I was told there had been a change in the procedure for accessing data. You should write an to the Director General of the GSO via email: hoptacquocte [at] gso [dot] gov [dot] vn to request for the data.
Last I heard (April 2022), the VHLSS datasets have become difficult to access. Mr. Nguyễn Thế Quân <ntquan at gso dot gov dot vn> has told researchers the GSO does not have a dissemination policy for the VHLSSs and thus cannot make it available.
Samples of the population censuses are available through IPUMS International for 1989, 1999, 2009, and 2019. However, some researchers have had access to a larger sample and with more detailed geographic information than is available through IPUMS International. Ms. Nguyen Thi Thanh Mai nttmai[at]gso[dot]gov[dot]vn has previously helped provide access to the 2014 intercensal population survey as well as samples of the 2009 and 2019 censuses with more detailed geographic identifiers than is available via IPUMS International.
The enterprise data is best accessed through Mr. Nguyen Viet Phong phonggsovn[at]yahoo[dot]com. I've heard of very different prices being paid by different researchers. I'm not 100% clear whether this is because the GSO is actually charging different prices or whether it is because some researchers are only buying access to some of the datasets from each year.
I have purchased access to the 2007 Establishment Census through contacting Ms. Hai Nguyen, redseanthhai[at]yahoo[dot]com. She seems able to help with accessing other datasets as well.