Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
mach hoc » cach hoc, anh hoc, bac hoc
dich hoc » sinh hoc, hinh hoc, tinh hoc
cuu cong » cua cong, thu cong, cac cong
cong hoc » dong hoc, cong hoa, cong coc
khoa hoc » hoa hoc
mai khoi » mai khoa, tai khoa, cac khoi
khoi cua » hoi cua, khi cua, kho cua
cua nhan » ca nhan, cua ngan, cua nha
nhan dan » phan dau, gian dan, nhan tai
hoc mai » hoc ma, hoc dai, hoc bai

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) or (dich hoc)) tap, nghien cuu cong hoc nganh khoa hoc mai khoi cua nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((mach hoc) OR (dich hoc)) tap, nghien cuu cong hoc nganh khoa hoc mai khoi cua nhan dan.
• Adding a wildcard symbol may retrieve word variants: tu ((mach hoc) or (dich hoc)) tap, nghien cuu cong hoc nganh khoa hoc mai khoi cua nhan dan*.