Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hanh trang » thanh trung, canh tranh, hanh trinh
cua tinh » cua sinh, va tinh, ha tinh
ban cong » bang cong, van cong, phan cong
cong san » cong tac
san toan » van toan, dan toan, manh toan
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: hoc ((thieu xanh) or (cua tinh)) - ((hanh trang) or (hanh chinh)) cua ban cong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (cua tinh)) - ((hanh trang) OR (hanh chinh)) cua ban cong san toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (cua tinh)) - ((hanh trang) or (hanh chinh)) cua ban cong san toan cau*.