Perhaps you should try some spelling variations:
nhan khong » nhan thong, nhanh chong, nganh khong
khong hoc » khung hoc, thong hoc, khong thuoc
sach hoc » cach hoc, sach hoi, mach hoc
hoc nhan » hoc nhanh, nhoc nhan, hoc phan
phan ung » phan xuong, phan cong
nhan dan » phan dau, gian dan, nhan tai
su sach » so sach, vu sach
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
hoc tai » hoc dai, hoc bai, hoc giai
tai hoi » tai khoi, dai hoi, tai hai

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: su sach hoc tap, nghien cuu mon hoc nhan khong hoc tai hoi va ((phan ung) OR (nhan dan))~.
• Adding a wildcard symbol may retrieve word variants: su sach hoc tap, nghien cuu mon hoc nhan khong hoc tai hoi va ((phan ung) or (nhan dan))*.