In addition to required, library-specific, academic sources, I am including a number of other sources that may be helpful to you.
Wikipedia? Yes!
https://en.wikipedia.org/wiki/Viet_Thanh_Nguyen
YouTube: U.S. Evacuation and Fall of Saigon
https://youtu.be/0BVRhsqHE5M?feature=shared
YouTube: Seeking Asylum: Facing Pirates, Storms, and Gunfire to Flee Vietnam
https://youtu.be/HNl7HAgI_I0?feature=shared
YouTube: Pulitzer Prize-winning novelist and Vietnam war refugee Nguyen on US identity
https://youtu.be/iSfmPHOd5c8?feature=shared
YouTube: Archiving Power: Vietnamese Refugee Studies and the Politics of Memory
https://youtu.be/vAt7qV0SoM4?feature=shared