Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
van thanh » ban thanh, van tuan
hieu van » hieu va, thien van, lieu va
lang van » tang van, hoang van, giang van
dang van » hoang van, hang va
lam duc » lam duoc, nam duoc, lam dung
cua tre » cua te, cuu tre, cua triet
can ky » van ky, dan ky, ban ky
tu can » tu ban, tu cac, thu canh

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu can ky ((lang van) or (dang van)) hoc. hieu van ((lam duc) OR (pham duc)) van thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu can ky ((lang van) OR (dang van)) hoc. hieu van ((lam duc) OR (pham duc)) van thanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu can ky ((lang van) or (dang van)) hoc. hieu van ((lam duc) OR (pham duc)) van thanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu can ky ((lang van) or (dang van)) hoc. hieu van ((lam duc) OR (pham duc)) van thanh dai cua tre*.