modify /etc/csh.cshrc add following
setenv LC_CTYPE en_US.ISO8859-1
setenv LC_ALL zh_TW.UTF-8
setenv LANG zh_TW.UTF-8
modify /etc/profile add following
export LC_CTYPE=en_US.ISO8859-1
export LC_ALL=zh_TW.UTF-8
export LANG=zh_TW.UTF-8