Seems to be connected to this political money laundering case [0], as the raids hit all the suspects listed.

Edit: The Duong family is also connected with the Long An Green Tech Park project outside Saigon [1][2] which had been moribund for almost a decade, and most likely was unlocked due to some backdoor dealings.

[0] - https://oaklandside.org/2020/09/15/accusations-of-political-...

[1] - https://baolongan.vn/de-xuat-thi-diem-khu-cong-nghiep-xanh-t...

[2] - https://theinvestor.vn/us-invested-firm-prepares-700-mln-for...