Perhaps you should try some spelling variations:
nhung chong » nhung cong, nhung phong, nhung phuong
luan nhung » luan chung, luan hung, quan nhung
hieu xanh » chieu xanh, hieu manh, hieu nganh
chong san » cong san, thong san, chong gian
doc hieu » toc thieu, hoc thieu, hoc hien
anh dung » anh dong, anh huong, ung dung
khan cap » khan ap, than cap, khoan cam
phan lap » phan dau

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 - ((anh dung) or (sach dung)) luan nhung chong san ((khan cap) or (phan lap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - ((anh dung) OR (sach dung)) luan nhung chong san ((khan cap) OR (phan lap)).
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - ((anh dung) or (sach dung)) luan nhung chong san ((khan cap) or (phan lap))*.