Perhaps you should try some spelling variations:
dang xay » dang van, van xay
thanh do » thanh de, thanh hoa, thanh loi
tu tang » tuc tang, tu trang, tu tong
duc van » duc va, duc tan, duc manh
ca viet » va viet, co viet, hoa viet
tang ky » dang ky, trong ky, tang khu
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
va cai » va bai, va dai, va cao

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

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