Hi there,
It looks very good. I would add Cao Bang and Ban Gioc waterfalls and Lung Cuu flagtower (45 min drive from Dong Van).
Are you leaving from Hanoi to Sa Pa first? If so, you could drive by Hoa Binh and add Moc Chau to your trip. It's also worthwhile.
Dien Bien Phu is also worth it, but it adds a lot of km to your trip.
Please note that the average speed will be about 40km/h. Be careful and don't rush. Traffic in VN is very particular.
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