Perhaps you should try some spelling variations:
hoang van » hang va
lang van » dang van, tang van, giang van
van hanh » van thanh, ban hanh, van anh
hieu tu » chieu tu, hieu tuc, hien tu
tu nang » tru nang, tu nong, tu nano
cua tre » cua te, cuu tre, cua triet
tu can » tu ban, tu cac, thu canh
can ky » van ky, dan ky, ban ky

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)) hoi. hieu tu nang luc ((van hanh) or (gia dinh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu can ky ((lang van) OR (hoang van)) hoi. hieu tu nang luc ((van hanh) OR (gia dinh)) dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu can ky ((lang van) OR (hoang van)) hoi. hieu tu nang luc ((van hanh) or (gia dinh)) dai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu can ky ((lang van) OR (hoang van)) hoi. hieu tu nang luc ((van hanh) or (gia dinh)) dai cua tre*.