Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, nganh nong
khong thuoc » khang thuoc, hong phuoc, dong thuoc
hoc nganh » hoc nhanh
nhan dann » nhan dang, phan dang, nhac dan
sach hoc » cach hoc, sach hoi, mach hoc
thuoc la » thuoc ma, thuoc va, thuoc tai
nhan dan » phan dau, gian dan, nhan tai
su sach » so sach, vu sach
cuu mot » cua mot, cuu mo, huu mot
mot hoc » mon hoc, mo hoc, mot goc
la hoi » lai hoi, xa hoi, le hoi

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 cuu mot hoc nganh khong thuoc la hoi va ((nhan dann) or (nhan dan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach hoc tap, nghien cuu mot hoc nganh khong thuoc la hoi va ((nhan dann) OR (nhan dan)).
• Adding a wildcard symbol may retrieve word variants: su sach hoc tap, nghien cuu mot hoc nganh khong thuoc la hoi va ((nhan dann) or (nhan dan))*.