THÚY ĐINH The Mountains Sing by Que Mai Phan Nguyen Hardcover, 352 pages In The Mountains Sing, Nguyễn Phan Quế Mai has created a luminous, complex family narrative that spans nearly a century of Vietnamese history, from the French colonial period through the communist Viet Minh’s rise to power, the separation between North and South Vietnam, the Vietnam War, all the way to the present day. Told alternately by Diệu Lan, born in 1920, and her granddaughter Hương, born in 1960, the novel resembles a choral performance with multiple voices. Diệu Lan is the family matriarch — bereft of father, husband, brother,…