Perhaps you should try some spelling variations:
va thuat » ky thuat, ki thuat, va thuc
cua tre » cua te, cuu tre, cua triet
hai cua » thai cua, dai cua, hoi cua
dan hai » doan hai, dang hai, dan khai
va cham » va chat, va tham
va dan » ca dan, va dao, va dau
xuc va » duc va, tuc va, luc va
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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