Well, of course the Vietnam War was very devastating to the country of Vietnam. Both the North and South were hurt badly. In the North, there was a lot of bombing by American planes. There were also lots and lots of soldiers who were killed in combat. Finally, the people had to make do with very little in the way of food and other necessities during the war.
In the South, the US sprayed Agent Orange to kill plants. This hurt the people economically (killed crops) and it led to major health problems for many people. As in the North, many people were killed by both sides. Many people were moved from their homes and became refugees.
So, as you would expect from a war that went on for years, it really hurt the Vietnamese people a lot.