Nguyễn Du
Whilst designed for native Vietnamese words, Nôm required the user to have a fair knowledge of chữ Hán, and thus chữ Nôm was used primarily for literary writings by cultural elites (such as the poetry of Nguyễn Du and Hồ Xuân Hương), while almost all other official writings and documents continued to be written in classical Chinese until the 20th century.