Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
van thanh » ban thanh, van tuan
lang van » tang van, hoang van, giang van
dang van » hoang van, hang va
lam luoc » lam duoc, lam thuoc, lam truoc
luoc van » luoc can, luoc va, luc van
cua tre » cua te, cuu tre, cua triet
tu can » tu ban, tu cac, thu canh
can ky » van ky, dan ky, ban ky
va lam » van lam, va lap

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. lieu va lam luoc 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. lieu va lam luoc van thanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu can ky ((lang van) or (dang van)) hoc. lieu va lam luoc van thanh dai cua tre*.