Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
cong thanh » dong thanh, cong trinh, truong thanh
hoc chieu » hoc thieu, ho chieu, hoc hien
huong tat » vuong tat, huong tac, huong tam
muong tac » tuong tac, huong tac, muong tay
cong tan » cong tac, cong san, cong ty
toan ban » van ban

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 - thanh ((huong tat) or (muong tac)) thong ((cong thanh) OR (cong tan)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu xanh - thanh ((huong tat) OR (muong tac)) thong ((cong thanh) OR (cong tan)) toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu xanh - thanh ((huong tat) or (muong tac)) thong ((cong thanh) OR (cong tan)) toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc chieu xanh - thanh ((huong tat) or (muong tac)) thong ((cong thanh) OR (cong tan)) toan ban*.