Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
van thanh » ban thanh, van tuan
hoang van » hang va
lang van » dang van, tang van, giang van
van cau » van dau, van hau, van chat
luc van » luoc van, luu van, duc van
cua tre » cua te, cuu tre, cua triet
van cam » van nam, van lam, van dam
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 (hoang van)) hoc. hieu ((van cam) or (van cau)) luc van thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu can ky ((lang van) OR (hoang van)) hoc. hieu ((van cam) OR (van cau)) luc van thanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu can ky ((lang van) OR (hoang van)) hoc. hieu ((van cam) or (van cau)) luc van thanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu can ky ((lang van) OR (hoang van)) hoc. hieu ((van cam) or (van cau)) luc van thanh dai cua tre*.