Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty hang » ly hang, ty xang, thi hang
hang xa » hoang xa, hang va, hang ca
va cham » va tham
va chat » van chat, va phat, cao chat
cuu ban » cuu van, cuu san, cuu nang
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 hang xa hoi. hieu ((va cham) or (va chat)) ((cuu ban) OR (cua ban)) thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty hang xa hoi. hieu ((va cham) OR (va chat)) ((cuu ban) OR (cua ban)) thanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty hang xa hoi. hieu ((va cham) or (va chat)) ((cuu ban) OR (cua ban)) thanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty hang xa hoi. hieu ((va cham) or (va chat)) ((cuu ban) OR (cua ban)) thanh dai cua tre*.