Ao dai is a traditional Vietnamese costume that is recognized globally for its elegance, beauty, and cultural significance. The word Ao dai translates to 'long dress,' and the style has evolved over the years. There are different synonyms to describe the ao dai, which reflects the various patterns, designs, and styles of the dress. Vietnamese authors and poets have often used different synonyms to describe the ao dai, such as 'trach ai vo tinh,' meaning 'the dress that brings sorrows to those who admire it.' Other synonyms are 'dai thanh ao,' which describes the colorful and beautiful patterns embroidered on the dress. Ultimately, the ao dai embodies the essence of Vietnamese heritage and culture, and different synonyms reflect its unique beauty and symbolism.