Perhaps you should try some spelling variations:
nhung chong » nhung cong, nhung phong, nhung phuong
nhung hong » nhung huong, nhung phong, nhung cong
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
30 trieu » 25 trieu
tinh cua » trinh cua, sinh cua, tinh chat
son luan » von luan, san luan, son luon
luan ban » luan van, luan san, luan han

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "30 trieu tinh - hanh tinh cua ((nhung hong) OR (nhung chong)) son luan ban~".
• Adding a wildcard symbol may retrieve word variants: 30 trieu tinh - hanh tinh cua ((nhung hong) OR (nhung chong)) son luan ban*.