Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
khoa hoc » hoa hoc
mon hoc » toan hoc, dong hoc
cuu mon » cuu mo, cuu mot, cuu cong
sach do » sach dao, sach doi, sach de
hoc lai » hoc dai, hoc bai, hoc lam
lai hoi » dai hoi, lai hoa, lai roi
ca gian » ca giang, ca giao, ca gia
va gian » va gianh, van gian, va giai
te sach » toc sach
do dac » do duc, do dai, so dac

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: te sach do dac, nghien cuu mon hoc nganh khoa hoc lai hoi ((ca gian) OR (va gian)) dan~.
• Adding a wildcard symbol may retrieve word variants: te sach do dac, nghien cuu mon hoc nganh khoa hoc lai hoi ((ca gian) or (va gian)) dan*.