Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
dang xay » dang van, van xay
cua tre » cua te, cuu tre, cua triet
san van » tan van, luan van, tran van
son van » song van, son va, ton van
hieu va » lieu va, hieu qua
lang xa » lang ha, lang van
va tai » va tac, va tap
te cac » tu cac, ve cac, te cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: te cac ky ((lang xa) or (dang xay)) hoi. hieu va tai ((son van) or (san van)) hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cac ky ((lang xa) OR (dang xay)) hoi. hieu va tai ((son van) OR (san van)) hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: te cac ky ((lang xa) or (dang xay)) hoi. hieu va tai ((son van) or (san van)) hanh dai cua tre*.