Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
quan dang » quang dang, quan lang, tuan dang
quan dong » quang dong, quan long, quan hoang
cong luan » tong luan, cong tuan, dong luan
luan phan » luan van, luan hoan
doc hieu » toc thieu, hoc thieu, hoc hien
canh ban » can ban, canh van, doanh ban
canh dan » canh van, sanh dan, thanh dan

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: doc hieu xanh - ((canh ban) OR (canh dan)) ((quan dang) OR (quan dong)) cong luan phan tu~.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - ((canh ban) or (canh dan)) ((quan dang) or (quan dong)) cong luan phan tu*.