Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
thai cua » than cua, tai cuc, tri cua
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu ve » hieu va
va hanh » va thanh, va danh, ban hanh
cua tre » cua te, cuu tre, cua triet

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

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