Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
thanh dai » thanh hai, thanh dat, thanh oai
doc sach » hoc sach, toc sach, nuoc sach
thi hang » thi hanh, thi nang, thi hong
te sach » toc sach
hieu va » lieu va, hieu qua
cuu tre » cua tre, cau tren, cau treo
cac duc » cac du, cao duc, cac dac
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: ((te sach) or (doc sach)) thi hang x hoi. hieu va cac duc va ((thanh dai) or (thanh tai)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (doc sach)) thi hang x hoi. hieu va cac duc va ((thanh dai) OR (thanh tai)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (doc sach)) thi hang x hoi. hieu va cac duc va ((thanh dai) or (thanh tai)) cuu tre*.