Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
sach thu » sach thue, sach thieu, sach tham
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
te sach » toc sach
dat cua » dai cua, day cua, mat cua
cac dac » cac dan, cac dai, cac bac
cua tre » cua te, cuu tre, cua triet
cac duc » cac du, cao duc, cac nuoc
hang x » hoang xa, chang xu, hang nxb

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thu ((hang x) OR (nang x)) hoi. hieu van ((cac duc) OR (cac dac)) va thanh dat cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thu ((hang x) or (nang x)) hoi. hieu van ((cac duc) OR (cac dac)) va thanh dat cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach thu ((hang x) or (nang x)) hoi. hieu van ((cac duc) OR (cac dac)) va thanh dat cua tre*.