Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
hieu ve » hieu va
cac xuc » cam xuc, cac nuoc, chat xuc
xuc van » duc van, luc van, xuc ban
cua tre » cua te, cuu tre, cua triet
tu san » thu san, tu ban, tu can
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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

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