Perhaps you should try some spelling variations:
danh thanh » dinh thanh, dang thanh, nhanh thanh
dan thanh » dang thanh, ban thanh, van thanh
dang cau » hang cau, bang cau, dang mau
te sach » toc sach
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
va chat » van chat, va phat, cao chat
ky dang » ky nang, ky danh
va cao » va cac, va co, va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky dang cau hoi. lieu ((va chat) or (va cao)) cac ((dan thanh) or (danh thanh)) hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang cau hoi. lieu ((va chat) OR (va cao)) cac ((dan thanh) OR (danh thanh)) hai cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky dang cau hoi. lieu ((va chat) or (va cao)) cac ((dan thanh) or (danh thanh)) hai cua tre*.