Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
dang xay » dang van, van xay
can viet » san viet, can biet, ca viet
thu ban » thu hang
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
va cham » va chat, va tham
duc van » duc va, duc tan, duc manh
pho can » cho can, pho cap, pho cam
ban ky » van ky, dan ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ban ky dang xay hoi. hieu ((va cham) or (va cac)) duc van thanh pho can viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ban ky dang xay hoi. hieu ((va cham) OR (va cac)) duc van thanh pho can viet.
• Adding a wildcard symbol may retrieve word variants: thu ban ky dang xay hoi. hieu ((va cham) or (va cac)) duc van thanh pho can viet*.