Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, hanh tai
thai cua » than cua, tai cuc, tri cua
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
cam duc » cam xuc, pham duc, nam duoc
cao duc » dao duc, cao suc, giao duc
dang xa » dang xay, lang xa, dang ha
hieu ve » hieu va
ky dang » ky nang, ky danh
dai ky » dan ky, dai ly, sai ky
su dai » sau dai, si dai, su tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su dai ky dang xa hoi. ((hieu ve) OR (hieu van)) ((cam duc) or (cao duc)) van hanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su dai ky dang xa hoi. ((hieu ve) OR (hieu van)) ((cam duc) OR (cao duc)) van hanh thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su dai ky dang xa hoi. ((hieu ve) OR (hieu van)) ((cam duc) or (cao duc)) van hanh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: su dai ky dang xa hoi. ((hieu ve) OR (hieu van)) ((cam duc) or (cao duc)) van hanh thai cua tre*.