Dear Nguyen Hoang Linh,
In order to access SCOPUS in the dormitory area, you have to use the off-campus link as follows :
http://0-www.scopus.com.opac.postech.ac.kr/home.url
You can also use other e-resources from the library : http://opac.postech.ac.kr/screens/srchhelp_erm_db.html
If you have any further questions, please feel free to contact us. Thanks.