Nguyen Nhat Anh's best-selling novel presented at Frankfurt Book Fair 10/14/2018 | 11:00 The book titled Toi Thay Hoa Vang Tren Co Xanh (I See Yellow Flowers on the Green Grass) by children’s best selling author Nguyen Nhat Anh is being introduced at the 2018 Frankfurt International Book Fair which runs October 9-14.