Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
nhanh lang » nhanh quang, nhanh thang, nhan dang
duong cong » dung cong, luong cong, duong trong
hoc thieu » toc thieu, hoc hien
lang luan » tang luan, hang luan, bang luan
dang cong » dung cong
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 - nhanh lang luan ((dang cong) or (duong cong)) ((dan toan) OR (dan than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - nhanh lang luan ((dang cong) OR (duong cong)) ((dan toan) OR (dan than)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - nhanh lang luan ((dang cong) or (duong cong)) ((dan toan) OR (dan than)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - nhanh lang luan ((dang cong) or (duong cong)) ((dan toan) OR (dan than)) cau*.