Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh dai » hanh tai, hanh dao, vanh dai
tu sach » thu sach, su sach, te sach
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
ca viet » va viet, co viet, hoa viet
sach ky » sac ky, sach y, sach ty
nang o » nang co, nang ho, nang ro
va lam » van lam, va lap
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 sach ky nang o hoi. hieu ((ve am) OR (va lam)) thuc va hanh dai ((va triet) OR (ca viet))~.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang o hoi. hieu ((ve am) or (va lam)) thuc va hanh dai ((va triet) or (ca viet))*.