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
xang dau » hang dau
tu sach » thu sach, su sach, te sach
doi tap » doi tac, doi dap, doi tai
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
va xang » va nang, va lang, va hang
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: tu sach doi tap, nghien cuu mon hoc ((nganh khoa) or (nganh khong)) hoc xa hoi va xang dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach doi tap, nghien cuu mon hoc ((nganh khoa) OR (nganh khong)) hoc xa hoi va xang dau.
• Adding a wildcard symbol may retrieve word variants: tu sach doi tap, nghien cuu mon hoc ((nganh khoa) or (nganh khong)) hoc xa hoi va xang dau*.