Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
chung cong » chong cong, phung cong, chung thong
nhung cong » dung cong, thong cong, hang cong
hieu xanh » hieu manh, hieu nganh, dieu hanh
tang luan » dung luan
anh tang » anh bang, anh dang, anh nang
tac nhan » tao nhan, cac nhan, dac nhan
nhan cau » nhanh cau, phan cau, nhan sau

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)) - anh tang luan ((chung cong) or (nhung cong)) tac nhan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (chieu xanh)) - anh tang luan ((chung cong) OR (nhung cong)) tac nhan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) OR (chieu xanh)) - anh tang luan ((chung cong) or (nhung cong)) tac nhan cau".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) OR (chieu xanh)) - anh tang luan ((chung cong) or (nhung cong)) tac nhan cau*.