Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh hai » thanh phan, thanh hoa, thanh san
hieu van » thien van, lieu va, hieu ve
te sach » toc sach
nam cac » nam cao, nam sach
hai cua » thai cua, dai cua, hoi cua
cam cac » ca cac, cam chan
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
y lang » o lang, _ lang, tay lang

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 y lang xa hoi. ((hieu van) OR (hieu va)) ((cam cac) or (nam cac)) ban thanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y lang xa hoi. ((hieu van) OR (hieu va)) ((cam cac) OR (nam cac)) ban thanh hai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y lang xa hoi. ((hieu van) OR (hieu va)) ((cam cac) or (nam cac)) ban thanh hai cua tre*".