Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
ban thanh » ban hanh, ban hang
sach thu » sach thue, sach thieu, sach tham
va chat » van chat, va phat, cao chat
cuu ban » cuu van, cua ban, cuu san
va cham » va tham
sach ty » sach y, sach tu, xach tay
hang xa » hoang xa, hang va, hang ca
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ty) OR (sach thu)) hang xa hoi. hieu ((va cham) or (va chat)) cuu ban thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach thu)) hang xa hoi. hieu ((va cham) OR (va chat)) cuu ban thanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) OR (sach thu)) hang xa hoi. hieu ((va cham) or (va chat)) cuu ban thanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) OR (sach thu)) hang xa hoi. hieu ((va cham) or (va chat)) cuu ban thanh dai cua tre*.