Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
sach doi » sach hoi, sach moi, sach dao
khoa hoc » hoa hoc
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, va phan, va nha
hoc xa » hoc ma

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 doi tap, nghien cuu mon hoc nganh khoa hoc xa hoi ((va nhan) OR (ca nhan)) va~.
• Adding a wildcard symbol may retrieve word variants: tu sach doi tap, nghien cuu mon hoc nganh khoa hoc xa hoi ((va nhan) or (ca nhan)) va*.