Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh tai, thanh oai
thanh van » thanh san, thanh toan, thanh phan
hoc sach » hoc sinh, hoc cac, hoc anh
sach tu » sach thu, cach tu, sach ty
cuu tre » cua tre, cau tren, cau treo
xay hoi » xa hoi, tay hoi, cay phoi
toc va » hoc va, toc ta, tuc va
tu van » tu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach tu van xay hoi. hieu ((va co) OR (vo co)) toc va ((thanh vai) or (thanh van)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach tu van xay hoi. hieu ((va co) OR (vo co)) toc va ((thanh vai) OR (thanh van)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach tu van xay hoi. hieu ((va co) OR (vo co)) toc va ((thanh vai) or (thanh van)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: hoc sach tu van xay hoi. hieu ((va co) OR (vo co)) toc va ((thanh vai) or (thanh van)) cuu tre*.