After graduating from secondary school, Oánh went on to attain a bachelor's degree in economics at the National College of Japan in 1944. Afterwards he would go on to earn his MA at Kyoto University in 1950. He would go on to pursue his PhD in economics from Harvard University in 1954.
Following graduation from secondary school, Oánh earned a bachelor's degree in economics at the National College of Japan in 1944. He continued his education by obtaining an MA from Kyoto University in 1950 and then pursued a PhD in economics from Harvard University in 1954.