Study of foreign tributary system in the Tang dynasty 并列题名:Study of foreign tributary system in the Tang dynasty Study on the four-ritual system in the Song Dynasty Study of the imperial examination system in the Tang dynasty Study on the tax legal system in the Qing Dynasty Study of festivals in the Tang dynasty Study of foreign cultures in Han dynasty Study on the marching system of the Tang Dynasty 并列题名:Study of the imperial examination system in the Tang dynasty 并列题名:Study on the four-ritual system in the Song Dynasty