Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
chieu xanh » chieu sach, chieu sang, chieu tinh
hoc chieu » hoc thieu, ho chieu, hoc hien
trong dan » trong dang, trong san, trong tan
dung cua » dung luan, dung cho
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.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc chieu xanh - hanh ((dung cua) or (trung tuan)) dung trong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu xanh - hanh ((dung cua) OR (trung tuan)) dung trong dan toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc chieu xanh - hanh ((dung cua) or (trung tuan)) dung trong dan toan cau*.