Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vai » thanh hai, thanh van, thanh tai
thu san » thuy san, thu ban, phu san
hieu va » lieu va, hieu qua
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
san ky » sang ky, van ky, dan ky
va nam » van nam, ha nam, va nay

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu san ky nang ((xa hoi) or (ma hoa)). hieu va nam cua ban thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu san ky nang ((xa hoi) OR (ma hoa)). hieu va nam cua ban thanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu san ky nang ((xa hoi) or (ma hoa)). hieu va nam cua ban thanh vai cua tre*.