Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
dang xay » dang van, van xay
hieu va » lieu va, hieu qua
vai cua » dai cua, hai cua, lai cua
cham ly » cam ly, cham lai
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu van
xay hoi » xa hoi, tay hoi, cay phoi
tu dang » thu dang, tu dong, su dang
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) OR (tu cac)) tu dang xay hoi. ((hieu ve) or (hieu va)) cham ly van hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (tu cac)) tu dang xay hoi. ((hieu ve) OR (hieu va)) cham ly van hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) OR (tu cac)) tu dang xay hoi. ((hieu ve) or (hieu va)) cham ly van hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) OR (tu cac)) tu dang xay hoi. ((hieu ve) or (hieu va)) cham ly van hanh vai cua tre*.