Perhaps you should try some spelling variations:
sach duoc » sach nuoc, sach dao, sach dung
hoc nhanh » hoc nganh, hoc phan
nhanh hoa » nhanh hoan, thanh hoa, khanh hoa
mach hoc » cach hoc, dich hoc, anh hoc
cuu dong » cuu cong, cuu tong, cuu long
dong hoc » dong co, dong luc
nhan dan » phan dau, gian dan, nhan tai
va nhan » van nhan, ca nhan, va phan
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: su ((sach duoc) or (mach hoc)) tap, nghien cuu dong hoc nhanh hoa hoc ma hoi va nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach duoc) OR (mach hoc)) tap, nghien cuu dong hoc nhanh hoa hoc ma hoi va nhan dan.
• Adding a wildcard symbol may retrieve word variants: su ((sach duoc) or (mach hoc)) tap, nghien cuu dong hoc nhanh hoa hoc ma hoi va nhan dan*.