Efficient information flow is the lifeblood of any business. So, Ssangyong research center designed computerized systems to provide computer-based services and name it STIS-I. But the service system is for the retrieval of document written in Alpha-Numeric letters So, the interal technical information written in Korean letters are neglected. But the failing to make use of this literature can result in costly duplication of research. Here are introduced the retrieval system of the internal technical information (STIS-II) by COHIRES (Conversational Hangeul Information Retrival System) which was put into operation 1983. Also the functions of the COHIRES are described.