Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
trang tuan » tran tuan, trung tuan, tran xuan
trong tuan » trong quan, trung tuan, trong tan
trong dan » trong dang, trong san, trong tan
ho chieu » theo chieu, hoc thieu, doi chieu
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

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: ho chieu xanh - hanh ((trang tuan) OR (trong tuan)) dung trong dan toan cau~.
• Adding a wildcard symbol may retrieve word variants: ho chieu xanh - hanh ((trang tuan) or (trong tuan)) dung trong dan toan cau*.