Perhaps you should try some spelling variations:
nhanh dong » hanh dong, nhanh chong, anh dong
dong thuoc » dung thuoc, dang thuoc, don thuoc
hoc nhanh » hoc nganh, hoc phan
sach hoc » cach hoc, sach hoi, mach hoc
cuu long » cuu cong, cuu tong, cuu nang
long hoc » dong hoc, long soc, long thuoc
thuoc ma » hoc ma, duoc ma
hang tai » hang va, dung tai
tu sach » thu sach, su sach, te sach
nhan va » nhan tai, nhan dan, nhan tao
ma hoi » mai hoi, xa hoi, ma hoa

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien cuu long hoc nhanh dong thuoc ma hoi va ((nhan va) OR (hang tai))~.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu long hoc nhanh dong thuoc ma hoi va ((nhan va) or (hang tai))*.