Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
toc sach » hoc sach, doc sach, thuoc sach
hang nxb » hang nha, hang nam, hang nga
va thanh » gia thanh, ban thanh, va tinh
sach ty » sach y, sach tu, sach thu
van bac » van ban, van bao, dan bac
van hac » van hoc, van ha, van hai
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: toc sach ty ((hang nxb) or (nang x)) hoi. hieu ((van bac) OR (van hac)) duc va thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty ((hang nxb) OR (nang x)) hoi. hieu ((van bac) OR (van hac)) duc va thanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty ((hang nxb) or (nang x)) hoi. hieu ((van bac) OR (van hac)) duc va thanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ty ((hang nxb) or (nang x)) hoi. hieu ((van bac) OR (van hac)) duc va thanh dai cua tre*.