Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
hieu xanh » chieu xanh, hieu manh, hieu nganh
trang tai » trang trai, tang tai, trang tri
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
tai dung » trai dung, thi dung, mai dung
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: doc hieu xanh - hanh trang tai dung cong ((xuan toan) or (dan than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - hanh trang tai dung cong ((xuan toan) OR (dan than)) cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh trang tai dung cong ((xuan toan) or (dan than)) cau*.