The Mountains Sing by Nguyen Phan Que Mai is a stunning read. The Audible recording is also particularly well done.
The haunting but hopeful story of a family trying to hold onto their home and homeland while blown apart by the Viet Nam war, the Communist disruption in the North, and the later Reeducation camps. A
The Sympathizer by Viet Thanh Nguyen follows the protagonist from Viet Nam to the US back to Viet Nam. It is a harrowing description of attempts at "reeducation" of South Vietnamese after the war. A Pulitzer Prize winner and I couldn't agree more! A
A Hundred Suns by Karin Tanabe and Sigh, Gone by Phuc Tran were both covered here before but I highly recommend both.
The Things They Carried by Tim O'Brien is a beloved book you probably read many years ago, but it is a great read for high schoolers if they have not done it in school.
And, finally, in tribute to Neil Sheehan and his spectacular career, his masterpiece of the war in Viet Nam, A Bright Shining Lie.