Perhaps you should try some spelling variations:
dam thuc » am thuc, dan thuc, dai thuc
hanh vai » hanh vi, hanh va, hanh tai
nam thuc » nam thuoc, am thuc, nam thu
so sach » so sanh, bo sach, co sach
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
cam tu » cam thu, nam tu, dam tu
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky nang ma hoi. hieu ve ((((dam thuc) or (cam tu))) or (nam thuc)) va hanh vai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang ma hoi. hieu ve ((((dam thuc) OR (cam tu))) OR (nam thuc)) va hanh vai cua vat.
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ma hoi. hieu ve ((((dam thuc) or (cam tu))) or (nam thuc)) va hanh vai cua vat*.