Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, nganh nong
hoc nganh » hoc nhanh
mach hoc » cach hoc, dich hoc, anh hoc
cuu cong » cua cong, thu cong, cac cong
cong hoc » dong hoc, cong hoa, cong coc
thuoc xa » thuoc va, thuoc la, thuoc tai
thuoc ma » hoc ma, duoc ma
tu mach » tu cach, tu manh, tu hach
nhan va » nhan tai, nhan dan, nhan tao
hoi ca » hoi cua, hoi cac, hoi cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu mach hoc tap, nghien cuu cong hoc nganh khong ((thuoc xa) or (thuoc ma)) hoi ca nhan va~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu mach hoc tap, nghien cuu cong hoc nganh khong ((thuoc xa) OR (thuoc ma)) hoi ca nhan va.
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien cuu cong hoc nganh khong ((thuoc xa) or (thuoc ma)) hoi ca nhan va*.