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 » tang luan, hang luan, dung luan
dong cong » duong cong, dung cong, dang cong
doc hieu » toc thieu, hoc thieu, hoc hien
dan than » ban than, van than, dan toan
dan chan » dan gian, dan ca, van chat

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