Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh hai » thanh phan, thanh hoa, thanh san
cua tre » cua te, cuu tre, cua triet
cam duc » cam xuc, cao duc, pham duc
hai cua » thai cua, dai cua, hoi cua
vu sach » vu bach, su sach, vu khach
ky mang » ky nang, ke mang, ky dang
may hoi » may thoi, tay hoi, mai hoi
hieu ve » hieu van
hieu va » lieu va, hieu qua
duc ban » duc tan, duc van, dua ban
su sac » su sach, su cac, su xac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sac) or (vu sach)) ky mang may hoi. ((hieu ve) or (hieu va)) cam duc ban thanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (vu sach)) ky mang may hoi. ((hieu ve) OR (hieu va)) cam duc ban thanh hai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sac) or (vu sach)) ky mang may hoi. ((hieu ve) or (hieu va)) cam duc ban thanh hai cua tre*.