Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh di » thanh doi, thanh de, thanh do
hoc sach » hoc sinh, hoc cac, hoc anh
dang xay » dang van, van xay
lang van » dang van, tang van, hoang van
te sach » toc sach
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
va tam » van tam, va tham, va tac
tam tu » nam tu, cam tu, dam tu
tu van » tu va
di cua » dai cua, doi cua, de cua

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 (hoc sach)) tay ((dang xay) or (lang van)) hoi. hieu va tam tu van thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (hoc sach)) tay ((dang xay) OR (lang van)) hoi. hieu va tam tu van thanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (hoc sach)) tay ((dang xay) or (lang van)) hoi. hieu va tam tu van thanh di cua tre*.