Perhaps you should try some spelling variations:
thieu xanh » hieu manh, thien anh, thien danh
chieu xanh » chieu sach, chieu sang, chieu tinh
hanh trinh » canh tranh, hanh chinh
thong cong » trong cong, tong cong, thong thong
trinh va » trinh van, trinh vat, trinh ve
va thong » va thuong, va phuong, he thong
tan toan » tap toan, van toan, dan toan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (chieu xanh)) - hanh trinh va thong cong ((tan toan) OR (tan tran)) ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) or (chieu xanh)) - hanh trinh va thong cong ((tan toan) OR (tan tran)) ban~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (chieu xanh)) - hanh trinh va thong cong ((tan toan) OR (tan tran)) ban*.