Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
tang van » dang van, hoang van, trong van
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, nam duoc
tai cua » thai cua, tai cuc, tri cua
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: tu sach ty ((tang van) or (lang xa)) hoi. hieu va ((cam duc) or (pham duc)) va thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((tang van) OR (lang xa)) hoi. hieu va ((cam duc) OR (pham duc)) va thanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((tang van) or (lang xa)) hoi. hieu va ((cam duc) or (pham duc)) va thanh tai cua tre*.