Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
thuc day » thuc dan, thuc vat
day hanh » day nhanh, day thanh, dao hanh
hanh dai » hanh tai, hanh dao, vanh dai
va triet » va thiet, va trien, ve triet
thu sac » thu sach, thu san, thu xac
hieu ve » hieu va, hieu van
sac ky » cac ky, sai ky
o hoi » co hoi, o hoc, o hai
ve am » va am

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sac ky nang ((x ho) or (o hoi)). hieu ve am thuc day hanh dai ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky nang ((x ho) OR (o hoi)). hieu ve am thuc day hanh dai ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sac ky nang ((x ho) or (o hoi)). hieu ve am thuc day hanh dai ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: thu sac ky nang ((x ho) or (o hoi)). hieu ve am thuc day hanh dai ((cua triet) OR (va triet))*.