The Vietnamese word "bồ tát" refers to the concept of a "bodhisattva" in Buddhism. A bodhisattva is a person who has attained enlightenment but chooses to remain in the cycle of life and death (samsara) to help others achieve enlightenment as well.
In more advanced discussions, "bồ tát" can also refer to specific bodhisattvas recognized in various sects of Buddhism, such as Quan Thế Âm (Avalokiteshvara) known for compassion, or Địa Tạng (Ksitigarbha), known for helping beings in hell.
While "bồ tát" primarily has a spiritual connotation, in some contexts, it can also refer to someone who is very generous or altruistic in their actions toward others.