Perhaps you should try some spelling variations:
duong thanh » dong thanh, muong thanh, luong thanh
theo chieu » theo tieu, theo chu, thi chieu
thanh toan » thanh hoa, thanh san, tinh toan
hanh tang » hanh trang, anh tang, hanh mang
ho chieu » hoc thieu, doi chieu, mot chieu
va tuong » va thuong, xa truong, va phuong
va thong » va thuong, va phuong, he thong
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: ((theo chieu) or (ho chieu)) xanh - hanh tang ((va tuong) OR (va thong)) duong thanh toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chieu) OR (ho chieu)) xanh - hanh tang ((va tuong) OR (va thong)) duong thanh toan cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chieu) or (ho chieu)) xanh - hanh tang ((va tuong) OR (va thong)) duong thanh toan cau*".