Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu xanh » chieu sach, chieu sang, chieu tinh
trang tuan » tran tuan, trung tuan, trong tuan
nhung cong » dung cong, thong cong, hang cong
tang luan » dung luan
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.

• Performing a fuzzy search may retrieve terms with similar spellings: theo chieu xanh - hanh ((trang tuan) or (tang luan)) nhung cong ((tac toan) OR (tap toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu xanh - hanh ((trang tuan) OR (tang luan)) nhung cong ((tac toan) OR (tap toan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu xanh - hanh ((trang tuan) or (tang luan)) nhung cong ((tac toan) OR (tap toan)) cao".
• Adding a wildcard symbol may retrieve word variants: theo chieu xanh - hanh ((trang tuan) or (tang luan)) nhung cong ((tac toan) OR (tap toan)) cao*.