Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
va thanh » va tinh, le thanh
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
van cac » van hac, van cau, van bac
cua tre » cua te, cuu tre, cua triet
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 nang x hoi. hieu van cac du ((((va thanh) OR (gia thanh))) or (ban thanh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang x hoi. hieu van cac du ((((va thanh) OR (gia thanh))) OR (ban thanh)) dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty nang x hoi. hieu van cac du ((((va thanh) OR (gia thanh))) or (ban thanh)) dai cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang x hoi. hieu van cac du ((((va thanh) OR (gia thanh))) or (ban thanh)) dai cua tre*.