Perhaps you should try some spelling variations:
tranh luan » trinh luan, trinh luat, doanh luan
luan cuong » luan cong, luan luong, xuan cuong
cuong dung » tuong duong, ung dung, thong dung
dung thanh » duong thanh, dong thanh, dang thanh
hieu sach » chieu sach, hieu cach, hieu cac
dien sach » dien anh
pho dau » phi dau, phu dau, phan dau
pho da » pho ha

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 sach) or (dien sach)) - canh tranh luan cuong dung thanh ((pho dau) or (pho da))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu sach) OR (dien sach)) - canh tranh luan cuong dung thanh ((pho dau) OR (pho da)).
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sach) or (dien sach)) - canh tranh luan cuong dung thanh ((pho dau) or (pho da))*.