Perhaps you should try some spelling variations:
tieu xanh » tieu danh, chieu xanh, dieu hanh
cua thang » cua hang, cua thanh, cua thuong
xua thang » xuan thang, xuan thanh, xuan trang
trong van » trong cac
anh tang » anh bang, anh dang, anh nang
van toan » van tuan, van tan, van thanh
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 tieu xanh - anh tang ((cua thang) or (xua thang)) trong van toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu xanh - anh tang ((cua thang) OR (xua thang)) trong van toan cau*.