Perhaps you should try some spelling variations:
khong thuoc » khang thuoc, hong phuoc, dong thuoc
thanh toan » thanh hoa, thanh san, tinh toan
hoc nhanh » hoc nganh
thuoc dai » thuoc tai, thuoc dac, thuoc sai
dan thanh » dang thanh, danh thanh, ban thanh
mach hoc » cach hoc, dich hoc, anh hoc
hoc phan » hoc dan, hoc pho
tu mach » tu cach, tu manh, tu hach
dai hoi » dai hoc, dai hai, dai moi
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: tu mach hoc tap, nghien cuu mo ((hoc nhanh) or (hoc phan)) khong thuoc dai hoi dan thanh toan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu mach hoc tap, nghien cuu mo ((hoc nhanh) OR (hoc phan)) khong thuoc dai hoi dan thanh toan.
• Adding a wildcard symbol may retrieve word variants: tu mach hoc tap, nghien cuu mo ((hoc nhanh) or (hoc phan)) khong thuoc dai hoi dan thanh toan*.