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

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