Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, nganh nong
nganh khoa » nganh hoa, doanh khoa, anh khoa
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
chau gian » cau giay, chau van, hau giang
hoi chau » hoi chu, hoi cham, hai chau
thu sach » tu sach, thuat sach, thuoc sach
sach doi » sach hoi, sach moi, sach dao
dong hoc » dong co, dong luc
thu dong » thuy dong, tu dong, thu cong
gian dan » gian lang
doi tap » doi tac, doi dap, doi tai
hoc xa » hoc ma

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

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