Perhaps you should try some spelling variations:
nhanh hoan » thanh hoang, thanh hoa, khanh hoa
hoc nhanh » hoc nganh, hoc phan
hanh phan » thanh phan, anh phan, hanh han
mach hoc » cach hoc, dich hoc, anh hoc
cuu toan » cuu hoan, cua toan, huu toan
toan hoc » toan khoa, van hoc, hoa hoc
hoan hoc » hoa hoc, hoang hoa, khoan hoi
te mach » ke mach, te sach, tim mach
hoc mai » hoc ma, hoc dai, hoc bai
hoi ban » hoi bai, doi ban, hoc ban
hoi dan » hoa dan, hoc dan, hoi dap

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

• Performing a fuzzy search may retrieve terms with similar spellings: te mach hoc tap, nghien cuu toan hoc nhanh hoan hoc mai ((hoi ban) or (hoi dan)) hanh phan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te mach hoc tap, nghien cuu toan hoc nhanh hoan hoc mai ((hoi ban) OR (hoi dan)) hanh phan.
• Adding a wildcard symbol may retrieve word variants: te mach hoc tap, nghien cuu toan hoc nhanh hoan hoc mai ((hoi ban) or (hoi dan)) hanh phan*.