Perhaps you should try some spelling variations:
nganh khoa » nganh khong, doanh khoa, anh khoa
nganh hoa » thanh hoa, khanh hoa, danh hoa
cau nhan » chau nhan, ca nhan, cu nhan
nhan dan » phan dau, gian dan, nhan tai
te sach » toc sach
sach do » sach dao, sach doi, sach de
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
hoi cau » hoi chu, hoc cau, hoa cau
do dap » doi dap, do dai, do dac
ma hoi » mai hoi, xa hoi, ma hoa

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach do dap, nghien cuu mon hoc ((nganh khoa) OR (nganh hoa)) hoc ma hoi cau nhan dan~".
• Adding a wildcard symbol may retrieve word variants: te sach do dap, nghien cuu mon hoc ((nganh khoa) OR (nganh hoa)) hoc ma hoi cau nhan dan*.