Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu xanh » chieu sach, chieu sang, chieu tinh
trung tuan » trung thanh, trung tam, tran tuan
trung cua » truong cua, trung cap, dung cua
tap toan » tap doan, tap quan, bai toan
van tan » van tuan, van ban, van tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chieu xanh - hanh ((trung cua) OR (trung tuan)) dung trong ((tap toan) or (van tan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu xanh - hanh ((trung cua) OR (trung tuan)) dung trong ((tap toan) OR (van tan)) cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu xanh - hanh ((trung cua) OR (trung tuan)) dung trong ((tap toan) or (van tan)) cau*".