Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cam thuc » cam thu, can thuc, cay thuc
nam thuc » nam thuoc, nam thu, nam tu
hanh vai » hanh vi, hanh va, hanh tai
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky danh » ky anh, ky dang
danh ma » anh ma, danh ca, hanh ma
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet

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 danh ma hoa. hieu van ((((cam thuc) OR (nam thuc))) or (am thuc)) va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky danh ma hoa. hieu van ((((cam thuc) OR (nam thuc))) OR (am thuc)) va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky danh ma hoa. hieu van ((((cam thuc) OR (nam thuc))) or (am thuc)) va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky danh ma hoa. hieu van ((((cam thuc) OR (nam thuc))) or (am thuc)) va hanh vai cua tre*.