Perhaps you should try some spelling variations:
khong thuoc » khang thuoc, hong phuoc, khoa thuoc
dong thuoc » dung thuoc, dang thuoc, don thuoc
danh thanh » dinh thanh, dang thanh, nhanh thanh
thanh toan » thanh hoa, thanh san, tinh toan
hoc nhanh » hoc nganh, hoc phan
hach hoc » cach hoc, mach hoc, hoach hoi
hoi danh » hop danh, hoi dan, hoc danh
tu hach » tu hanh, tu cach, tu sach
dai hoi » dai hoc, dai hai, dai moi
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 danh thanh toan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu hach hoc tap, nghien cuu mo hoc nhanh ((khong thuoc) OR (dong thuoc)) dai hoi danh 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 danh thanh toan*.