The Vietnamese word "đa tạ" means to show deep gratitude or to express heartfelt thanks. It is used when someone wants to convey a strong sense of appreciation for something someone else has done. This phrase is often used in formal situations or when expressing sincere thanks to someone for a significant favor or help.
"Đa tạ" primarily means to express gratitude, but in some contexts, it can also imply respect and acknowledgment of someone's efforts or kindness.