Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
canh trinh » canh tranh, hanh trinh, canh tinh
trinh luan » trinh luat, trinh quan, trinh han
hoc thieu » toc thieu, hoc hien
dinh cong » dinh cuong, dinh long, minh cong
dinh hong » dinh huong, dinh hung, dinh thuong
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than

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 - canh trinh luan ((dinh cong) or (dinh hong)) ((dan toan) OR (dan than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - canh trinh luan ((dinh cong) OR (dinh hong)) ((dan toan) OR (dan than)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - canh trinh luan ((dinh cong) or (dinh hong)) ((dan toan) OR (dan than)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - canh trinh luan ((dinh cong) or (dinh hong)) ((dan toan) OR (dan than)) cau*.