Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
thu cac » tu cac, thu xac, thu cuc
hieu va » lieu va
va hanh » van hanh, va danh, ban hanh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
cac lo » cac lop, cac co, cac bo
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: thu cac ky nang x hoi. ((hieu va) OR (hieu qua)) cac lo ((va hanh) or (va thanh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu cac ky nang x hoi. ((hieu va) OR (hieu qua)) cac lo ((va hanh) OR (va thanh)) vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu cac ky nang x hoi. ((hieu va) OR (hieu qua)) cac lo ((va hanh) or (va thanh)) vai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu cac ky nang x hoi. ((hieu va) OR (hieu qua)) cac lo ((va hanh) or (va thanh)) vai cua tre*.