Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
nong huong » dong huong, cong thuong, dong thuong
cong huong » cong thuong, cong luong, cong hung
hieu xanh » hieu manh, hieu nganh, dieu hanh
nhan dang » nhan dan, phan dang, tran dang
dang luan » dung luan, tang luan, hang luan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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) OR (chieu xanh)) - nhan dang luan ((nong huong) or (cong huong)) dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (chieu xanh)) - nhan dang luan ((nong huong) OR (cong huong)) dan toan cao*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) OR (chieu xanh)) - nhan dang luan ((nong huong) or (cong huong)) dan toan cao*".