Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
thanh hang » thanh hoang, thanh thang, tranh hang
luong hoa » luong khoa, luong hoai, huong hoa
khau luan » khoa luan, phap luan, pham luan
sach hoc » cach hoc, sach hoi, mach hoc
luong ha » luong va, long ha, luong khoa
hang hoa » hang khoa, thanh hoa, hang va
hoi khau » thoi khac, hoi chu, hoi khoa
su sach » so sach, vu sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach hoc tap, nghien thu ((luong hoa) OR (luong ha)) thanh hang hoa xa hoi khau luan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach hoc tap, nghien thu ((luong hoa) OR (luong ha)) thanh hang hoa xa hoi khau luan van".
• Adding a wildcard symbol may retrieve word variants: su sach hoc tap, nghien thu ((luong hoa) OR (luong ha)) thanh hang hoa xa hoi khau luan van*.