Perhaps you should try some spelling variations:
nganh hoa » thanh hoa, khanh hoa, danh hoa
mach hoc » cach hoc, dich hoc, anh hoc
cuu cong » cua cong, thu cong, cac cong
cong hoc » dong hoc, cong hoa, cong coc
anh khoa » doanh khoa, hang khoa
cac nhan » ca nhan, cac nha, cam nhan
nhan dan » phan dau, gian dan, nhan tai
tu mach » tu cach, tu manh, tu hach
hoi cac » hoc cac, voi cac, hoa cac
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 mach hoc tap, nghien cuu cong hoc ((anh khoa) or (nganh hoa)) hoc xa hoi cac nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu mach hoc tap, nghien cuu cong hoc ((anh khoa) OR (nganh hoa)) hoc xa hoi cac nhan dan.
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien cuu cong hoc ((anh khoa) or (nganh hoa)) hoc xa hoi cac nhan dan*.