The Vietnamese word "binh đoàn" is a noun that generally translates to "corps" in English. It refers to a large military unit that consists of multiple battalions, regiments, or divisions. Essentially, "binh đoàn" denotes a significant group of troops organized for military operations.
While primarily used in a military context, "binh đoàn" can also metaphorically refer to any organized group of people working together towards a common goal, though this usage is less common.