Perhaps you should try some spelling variations:
dang xay » dang van, van xay
hanh tai » thanh tai, hang tai, han tai
hanh dai » hanh dao, vanh dai, thanh dat
tu cach » tu cac
cach tu » cach thuc
cham ly » cam ly, cham lai
hieu va » lieu va, hieu qua
hieu ve » hieu van
xay hoi » xa hoi, tay hoi, cay phoi
tu dang » thu dang, tu dong, su dang
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) OR (hanh tai)) 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) OR (hanh tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cach tu dang xay hoi. ((hieu ve) or (hieu va)) cham ly van ((hanh dai) OR (hanh tai)) 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) OR (hanh tai)) cua tre*.