Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
mong luan » tong luan, cong luan, dong luan
bang luan » hang luan, dung luan, tong luan
tang luan » dung luan
dong cong » duong cong, dung cong, dang cong
doc hieu » toc thieu, hoc thieu, hoc hien
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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 - hanh ((mong luan) OR (((bang luan) OR (tang luan)))) dong cong dan than cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - hanh ((mong luan) or (((bang luan) OR (tang luan)))) dong cong dan than cau~".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh ((mong luan) or (((bang luan) OR (tang luan)))) dong cong dan than cau*.