Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
khoa hoc » hoa hoc
va gianh » va gian, van giang, va giai
te sach » toc sach
sach do » sach dao, sach doi, sach de
hoc mai » hoc ma, hoc dai, hoc bai
mai hoi » mai khoi, dai hoi, lai hoi
ca gian » ca giang, ca giao, va gian
do dac » do duc, do dai, so dac
mo hoc » mon hoc, co hoc

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