Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, nganh nong
hoc nganh » hoc nhanh
sach doi » sach hoi, sach moi, sach dao
tu sach » thu sach, su sach, te sach
doi tap » doi tac, doi dap, doi tai
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
va nhan » van nhan, ca nhan, va phan
nhan va » nhan tai, nhan dan, nhan tao

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