Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
van thanh » ban thanh, van tuan
hieu va » lieu va, hieu qua
tai cua » thai cua, tai cuc, tri cua
duc van » duc va, duc tan, duc manh
cam duc » cam xuc, cao duc, pham duc
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
hieu ve » hieu van

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky ((lang xa) or (mang may)) hoi. ((hieu ve) OR (hieu va)) cam duc van thanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky ((lang xa) OR (mang may)) hoi. ((hieu ve) OR (hieu va)) cam duc van thanh tai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky ((lang xa) or (mang may)) hoi. ((hieu ve) OR (hieu va)) cam duc van thanh tai cua tre*".