Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
thanh dai » thanh hai, thanh dat, thanh oai
thu sach » tu sach, thuat sach, thuoc sach
van nang » van quang, van ban, van dong
hieu van » hieu va, thien van, lieu va
sach van » sach han, sach va, bach van
cua tre » cua te, cuu tre, cua triet
hoc cac » hoc cao
hac cac » thac cac, hay cac, phan cac
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: thu sach van nang x hoi. hieu van ((hac cac) OR (hoc cac)) van ((thanh dai) or (thanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach van nang x hoi. hieu van ((hac cac) OR (hoc cac)) van ((thanh dai) OR (thanh tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach van nang x hoi. hieu van ((hac cac) OR (hoc cac)) van ((thanh dai) or (thanh tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach van nang x hoi. hieu van ((hac cac) OR (hoc cac)) van ((thanh dai) or (thanh tai)) cua tre*.