Perhaps you should try some spelling variations:
dang xay » dang van, van xay
ban hanh » ban hang
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
hieu ve » hieu van
hieu va » lieu va, hieu qua
duc ban » duc tan, duc van, dua ban
hai cuc » hai cua, thai cua, hai huoc
su cac » tu cac, su cao, su can

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

• Performing a fuzzy search may retrieve terms with similar spellings: su cac ky dang xay hoi. ((hieu ve) or (hieu va)) pham duc ban hanh ((hai cuc) or (tai cuc)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su cac ky dang xay hoi. ((hieu ve) OR (hieu va)) pham duc ban hanh ((hai cuc) OR (tai cuc)) tre.
• Adding a wildcard symbol may retrieve word variants: su cac ky dang xay hoi. ((hieu ve) or (hieu va)) pham duc ban hanh ((hai cuc) or (tai cuc)) tre*.