Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, nganh nong
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
hoc nganh » hoc nhanh
khong hoc » khung hoc, thong hoc, khong thuoc
cong hoc » dong hoc, cong hoa, cong coc
nhan dan » phan dau, gian dan, nhan tai
tu sach » thu sach, su sach, te sach
hoi tap » hoi dap, hoi tai, hai tap
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.

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