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