Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, nganh nong
nghien cac » nghiep cach, nghien cuu, nghiep cay
nganh khoa » nganh hoa, doanh khoa, anh khoa
sach hoc » cach hoc, sach hoi, mach hoc
cac cong » cua cong
cong hoc » dong hoc, cong hoa, cong coc
cua phan » cua nhan, cua phap, cua han
phan dau » phan tu, hang dau
tu sach » thu sach, su sach, te sach
hoc xa » hoc ma
xa hoc » xa hoi, va hoc, xa hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach hoc tap, nghien cac cong hoc ((nganh khoa) or (nganh khong)) hoc xa hoc cua phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien cac cong hoc ((nganh khoa) OR (nganh khong)) hoc xa hoc cua phan dau.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cac cong hoc ((nganh khoa) or (nganh khong)) hoc xa hoc cua phan dau*.