Perhaps you should try some spelling variations:
hanh than » hanh han, hanh nhan, hanh phan
van hanh » van thanh, ban hanh, van anh
than cua » nhan cua, thai cua, ban cua
nang xa » nang x, lang xa, nang ma
cao duc » dao duc, cao suc, giao duc
cua tre » cua te, cuu tre, cua triet
dai ky » dan ky, dai ly, sai ky

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

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