Study on utilitarian thoughts of the Pre-Qin period 并列题名：Study on utilitarian thoughts of the Pre-Qin period Study on utilitarian thoughts of the Song dynasty 并列题名：Study on utilitarian thoughts of the Song dynasty Study of the military intelligence thoughts of pre-qin period 并列题名：Study of the military intelligence thoughts of pre-qin period Treatise on diplomatic diction in the pre-qin period