Perhaps you should try some spelling variations:
nganh khong » nhanh chong, nganh nong, nganh khoa
nganh cong » nhanh chong, thanh cong
sach hoc » cach hoc, sach hoi, mach hoc
cau nhan » chau nhan, ca nhan, cu nhan
nhan tai » hang tai, van tai, toan tai
tu sach » thu sach, su sach, te sach
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
hoi cau » hoi chu, hoc cau, hoa cau
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: tu sach hoc tap, nghien cuu mon hoc ((nganh khong) or (nganh cong)) hoc ma hoi cau nhan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien cuu mon hoc ((nganh khong) OR (nganh cong)) hoc ma hoi cau nhan tai.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu mon hoc ((nganh khong) or (nganh cong)) hoc ma hoi cau nhan tai*.