Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, nganh nong
nganh khoa » nganh hoa, doanh khoa, anh khoa
sach doi » sach hoi, sach moi, sach dao
cuu dong » cuu cong, cuu tong, cuu long
dong hoc » dong co, dong luc
van phan » van phong, van thanh, luan phan
phan dan » phan dang, phan dau, nhan dan
te sach » toc sach
doi tap » doi tac, doi dap, doi tai
hoi van » hoi va, hoi dan, hai van
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach doi tap, nghien cuu dong hoc ((nganh khoa) or (nganh khong)) hoc ma hoi van phan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach doi tap, nghien cuu dong hoc ((nganh khoa) OR (nganh khong)) hoc ma hoi van phan dan.
• Adding a wildcard symbol may retrieve word variants: te sach doi tap, nghien cuu dong hoc ((nganh khoa) or (nganh khong)) hoc ma hoi van phan dan*.