Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
can thuc » dan thuc, van thuc, cay thuc
va triet » va trien, ve triet, cua triet
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hanh vu » hanh vi, hanh va, hanh tu
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho
thiet » thieu

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 y nang x hoi. ((hieu van) OR (hieu va)) can thuc va hanh vu ((va triet) OR (va thiet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x hoi. ((hieu van) or (hieu va)) can thuc va hanh vu ((va triet) OR (va thiet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. ((hieu van) or (hieu va)) can thuc va hanh vu ((va triet) OR (va thiet))*.