Perhaps you should try some spelling variations:
dang xay » dang van, van xay
van hanh » van thanh, ban hanh, van anh
hanh dai » hanh tai, hanh dao, vanh dai
tu cach » tu cac
cach tu » cach thuc
tu dang » thu dang, tu dong, su dang
xay hoi » xa hoi, tay hoi, cay phoi
hieu ve » hieu van
hieu va » lieu va, hieu qua
cham ly » cam ly, cham lai
cua tre » cua te, cuu tre, cua triet
ly van » le van, ly va, ly von

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cach tu dang xay hoi. ((hieu ve) or (hieu va)) cham ly van hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cach tu dang xay hoi. ((hieu ve) OR (hieu va)) cham ly van hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu cach tu dang xay hoi. ((hieu ve) or (hieu va)) cham ly van hanh dai cua tre*.