Buffalo Little Keeper'song, created in 1964. Part of a set of works after a field trip to the Central Region, this meaningful timber inspired from traditional children type rhyme was Hoàng Vân's first children's song. 

This song has paved the way for the success of her children's works for three decades, many of them are still sung daily by the kids until today. Three of his songs (I love my school, The Flamboyant Season, The Spring in My Motherland) were voted "Best 50 Children's Songs in the 20th Century".