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 cap » truong cao, trung tam
dung cong » dung trong
tac toan » tam toan, hach toan, tich toan
tap toan » tap doan, tap quan, bai toan

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 ((trung tuan) OR (trung cap)) dung cong ((tac toan) OR (tap toan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu xanh - thanh ((trung tuan) or (trung cap)) dung cong ((tac toan) OR (tap toan)) cau~".
• Adding a wildcard symbol may retrieve word variants: theo chieu xanh - thanh ((trung tuan) or (trung cap)) dung cong ((tac toan) OR (tap toan)) cau*.