Perhaps you should try some spelling variations:
thien danh » thien anh, thien dang, thien thanh
chieu xanh » chieu sach, chieu sang, chieu tinh
doanh khoa » toan khoa
thong cong » trong cong, tong cong, thong thong
va thong » va thuong, va phuong, he thong
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 ((thien danh) or (chieu xanh)) - ((doanh khoa) or (doanh nhan)) va thong cong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien danh) OR (chieu xanh)) - ((doanh khoa) OR (doanh nhan)) va thong cong san toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thien danh) or (chieu xanh)) - ((doanh khoa) or (doanh nhan)) va thong cong san toan cau*.