Perhaps you should try some spelling variations:
cham xuc » cam xuc, chat xuc, cham soc
hieu ve » hieu van
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va
vi cua » vai cua, di cua
o hoi » co hoi, o hoc, o hai

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