Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
lam thuc » lam thuoc, am thuc, nam thuc
va triet » va thiet, va trien, ve triet
te sach » toc sach
sach ky » sac ky, sach y, sach ty
van lam » van nam
va hanh » van hanh, va thanh, va danh
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang ((x ho) or (xa hoi)). hieu van lam thuc ((va dan) or (va hanh)) mai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((x ho) OR (xa hoi)). hieu van lam thuc ((va dan) OR (va hanh)) mai va triet.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((x ho) or (xa hoi)). hieu van lam thuc ((va dan) or (va hanh)) mai va triet*.