Perhaps you should try some spelling variations:
theo chieu » theo tieu, theo chu, thi chieu
canh thanh » danh thanh, anh thanh, nhanh thanh
trong toan » truong toan, trong tan, trong hoan
toan phan » thanh phan, toan ban, hoa phan
ho chieu » hoc thieu, doi chieu, mot chieu
qua dung » quang dung, su dung, qua song
phan cau » phan dau, phan cac, phan tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (theo chieu)) xanh - ((canh thanh) OR (canh tranh)) qua dung trong toan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (theo chieu)) xanh - ((canh thanh) OR (canh tranh)) qua dung trong toan phan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) or (theo chieu)) xanh - ((canh thanh) OR (canh tranh)) qua dung trong toan phan cau".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (theo chieu)) xanh - ((canh thanh) OR (canh tranh)) qua dung trong toan phan cau*.