Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh van » thanh san, thanh toan, thanh phan
sach thu » sach thue, sach thieu, sach tham
van cua » vang cua, ban cua, dan cua
tuc ban » thuc ban, truc ban, tu ban
sach ty » sach y, sach tu, xach tay
vang xa » lang xa, mang xa, ang xa
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: thu ((sach ty) OR (sach thu)) vang xa hoi. hieu ((va bai) or (va cac)) tuc ban thanh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ty) OR (sach thu)) vang xa hoi. hieu ((va bai) OR (va cac)) tuc ban thanh van cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ty) OR (sach thu)) vang xa hoi. hieu ((va bai) or (va cac)) tuc ban thanh van cua tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ty) OR (sach thu)) vang xa hoi. hieu ((va bai) or (va cac)) tuc ban thanh van cua tre*.