Perhaps you should try some spelling variations:
khong thuoc » khang thuoc, hong phuoc, khoa thuoc
dong thuoc » dung thuoc, dang thuoc, don thuoc
thanh toan » thanh hoa, thanh san, tinh toan
hoc nhanh » hoc nganh, hoc phan
dan thanh » dang thanh, danh thanh, ban thanh
hach hoc » cach hoc, mach hoc, hoach hoi
tu hach » tu hanh, tu cach, tu sach
dai hoi » dai hoc, dai hai, dai moi
hoi dan » hoa dan, hoc dan, hoi dap
mo hoc » mon hoc, co hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu hach hoc tap, nghien cuu mo hoc nhanh ((khong thuoc) OR (dong thuoc)) dai hoi dan thanh toan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu hach hoc tap, nghien cuu mo hoc nhanh ((khong thuoc) OR (dong thuoc)) dai hoi dan thanh toan".
• Adding a wildcard symbol may retrieve word variants: tu hach hoc tap, nghien cuu mo hoc nhanh ((khong thuoc) OR (dong thuoc)) dai hoi dan thanh toan*.