Perhaps you should try some spelling variations:
danh ngon » danh nhan, dinh ngoc
hay thuat » phau thuat, my thuat, va thuat
thuat co » thuat do, thuat o
ban ngon » bang ngon, ban ngo, luan ngon
ngon hay » ngan hay, ngoc hai, ngoc ha
toan hoc » toan khoa, van hoc, hoa hoc
so ban » sao ban, so bang, co ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su ((danh ngon) or (canh ngon)) ky thuat co hoc ) or ( so ban ngon hay thuat toan hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su ((danh ngon) OR (canh ngon)) ky thuat co hoc ) OR ( so ban ngon hay thuat toan hoc )).
• Adding a wildcard symbol may retrieve word variants: (( su ((danh ngon) or (canh ngon)) ky thuat co hoc ) or ( so ban ngon hay thuat toan hoc ))*.