Perhaps you should try some spelling variations:
dong thuong » cong thuong, dong thong, dung thuong
theo chieu » theo tieu, ho chieu, theo chu
chieu xanh » chieu sach, chieu sang, chieu tinh
thanh dung » thanh duong, thanh tung, thanh hung
dung cao » duong cao, dung cho, dung co
cao dong » cao dang, lao dong, cao cong
dan toan » van toan, dan than, manh toan
van tan » van tuan, van ban, van tai

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu xanh - thanh dung cao dong thuong ((dan toan) OR (van tan)) cau~.
• Adding a wildcard symbol may retrieve word variants: theo chieu xanh - thanh dung cao dong thuong ((dan toan) or (van tan)) cau*.