Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
so sach » so sanh, bo sach, hoc sach
co sach » bo sach, cuon sach, hoc sach
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
hanh di » hanh vi, hanh de, hang di
hieu ve » hieu va, hieu van
nam tuc » nam thuc, nam truc, nam thuoc
nam tu » nam thu, nam thuc
ma hoi » mai hoi, xa hoi, ma hoa
di cua » dai cua, doi cua, de cua

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) or (co sach)) ky tang ma hoi. hieu ve ((nam tuc) or (nam tu)) van hanh di cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (co sach)) ky tang ma hoi. hieu ve ((nam tuc) OR (nam tu)) van hanh di cua vat.
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (co sach)) ky tang ma hoi. hieu ve ((nam tuc) or (nam tu)) van hanh di cua vat*.