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
nhung cong » dung cong, thong cong, hang cong
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan ban » van ban

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