Perhaps you should try some spelling variations:
han thuong » hang thuong, phan thuong, lan thuong
thuong hoc » truong hoc, tuong hoc, thuong ho
dong duoc » dong quoc, dong duong, trong duoc
sach hoc » cach hoc, sach hoi, mach hoc
cuu dong » cuu cong, cuu tong, cuu long
duoc han » duoc ha, duc han, duoc ban
nhan dan » phan dau, gian dan, nhan tai
tu sach » thu sach, su sach, te sach
nha van » nha lanh
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach hoc tap, nghien cuu dong duoc han thuong hoc ma hoi va ((nha van) or (nhan dan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien cuu dong duoc han thuong hoc ma hoi va ((nha van) OR (nhan dan)).
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu dong duoc han thuong hoc ma hoi va ((nha van) or (nhan dan))*.