Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, nganh nong
khong thuoc » khang thuoc, hong phuoc, dong thuoc
sach thue » sach thieu, sach tham, cach thuc
goc nganh » hoc nganh, hoc nhanh, cac nganh
sach thu » sach thieu, sach tham, cach thuc
thuoc ma » hoc ma, duoc ma
nhan dan » phan dau, gian dan, nhan tai
cuu mot » cua mot, cuu mo, huu mot
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: tu ((sach thu) or (sach thue)) trac, nghien cuu mot goc nganh khong thuoc ma hoi va nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thu) OR (sach thue)) trac, nghien cuu mot goc nganh khong thuoc ma hoi va nhan dan.
• Adding a wildcard symbol may retrieve word variants: tu ((sach thu) or (sach thue)) trac, nghien cuu mot goc nganh khong thuoc ma hoi va nhan dan*.