Do Vietnamese F-1 students have a reduced capital gains tax in the US?

From what I know, F-1 students that need to pay capital gains tax in the US have a flat rate of 30%, "unless a tax treaty allows for a reduced rate" (according to the IRS). My question is, "does the US and Vietnam have any tax treaty that allows for a reduced rate, or are Vietnamese US-based students subject to the 30% rate?

IRS Source: https://www.irs.gov/individuals/international-taxpayers/the-taxation-of-capital-gains-of-nonresident-alien-students-scholars-and-employees-of-foreign-governments