Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
va triet » va trien, ve triet, cua triet
ca viet » va viet, co viet, hoa viet
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
sac ky » cac ky, sai ky
nang o » nang co, nang ho, nang ro
tu sac » tu sach, tu cac, tu san
ve am » va am
o hoi » co hoi, o hoc, o hai

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang o hoi. hieu ve am thuc va hanh dai ((((va triet) OR (va thiet))) OR (ca viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang o hoi. hieu ve am thuc va hanh dai ((((va triet) OR (va thiet))) or (ca viet))~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang o hoi. hieu ve am thuc va hanh dai ((((va triet) OR (va thiet))) or (ca viet))*.