Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh dat, thanh oai
thanh tai » thanh hai, thanh toan, doanh tai
toc sach » hoc sach, doc sach, thuoc sach
cac dac » cac dan, cac dai, cac bac
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
cac duc » cac du, cao duc, cac nuoc
hieu va » lieu va, hieu qua
ty hang » ly hang, ty xang, thi hang
hang x » nang x, hoang xa, chang xu
x hoi » xa hoi, o hoi, x ho

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