Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
dang xay » dang van, van xay
thanh di » thanh doi, thanh de, thanh do
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
cua duc » cua tuc, cua nuoc, cua quoc
ca viet » va viet, co viet, hoa viet
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
ca duc » cao duc, ca dua, ha duc
di ca » di cau, di cua, doi ca

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky dang xay hoi. hieu qua ((ca duc) OR (cua duc)) van thanh di ca viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky dang xay hoi. hieu qua ((ca duc) OR (cua duc)) van thanh di ca viet".
• Adding a wildcard symbol may retrieve word variants: tu san ky dang xay hoi. hieu qua ((ca duc) OR (cua duc)) van thanh di ca viet*.