Perhaps you should try some spelling variations:
hanh than » hanh han, hanh nhan, hanh phan
nam duoc » nam thuoc, da duoc, dat duoc
than cua » nhan cua, thai cua, ban cua
van hanh » van thanh, ban hanh, van anh
cao duc » dao duc, cao suc, giao duc
cua tre » cua te, cuu tre, cua triet
cam duc » cam xuc, pham duc, lam duoc
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
sac ky » cac ky, sai ky
su sac » su sach, su cac, su xac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky tang xa hoi. hieu qua ((((cam duc) or (nam duoc))) or (cao duc)) van hanh than cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky tang xa hoi. hieu qua ((((cam duc) OR (nam duoc))) OR (cao duc)) van hanh than cua tre.
• Adding a wildcard symbol may retrieve word variants: su sac ky tang xa hoi. hieu qua ((((cam duc) or (nam duoc))) or (cao duc)) van hanh than cua tre*.