Perhaps you should try some spelling variations:
chuong trinh » cong trinh
cuoi viet » nguoi viet, co viet, nuoc viet
trinh cao » trinh chao, trinh cau, tinh cao
trinh co » trinh do, trinh cong, trinh hoa
cao bang » cao dang, cao tang, cao nang
so viet » hoc viet
cac cot » cac co, cac cong, cac chat
oi viet » hoi viet, o viet, gioi viet
cao van » cac van, dao van, cao dang
cao lan » cao dang, cao tang, cao nang
cac cay » ca cay, cac cam, cac cap
cao co » cao cho, cac co, co co
ca cao » ca dao, cu cao, va cao
co van » vo van, so van, do van
cay co » cac co, tay co, cay cong
van va » van vat, van van, ban va
ca cac » cua cac
van ca » van cau, van cua, dan ca
va ca » va cao, va cai, va cau

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (((( chuong trinh cao van va ca cao co so viet nam ) OR ( chuong trinh co van va cac cay co ((oi viet) OR (cuoi viet)) nam ))) OR ( chuong trinh ((cao lan) OR (cao bang)) van ca cac cot n((oi viet) OR (cuoi viet)) nam ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( chuong trinh cao van va ca cao co so viet nam ) or ( chuong trinh co van va cac cay co ((oi viet) OR (cuoi viet)) nam ))) or ( chuong trinh ((cao lan) or (cao bang)) van ca cac cot n((oi viet) OR (cuoi viet)) nam ))~".
• Adding a wildcard symbol may retrieve word variants: (((( chuong trinh cao van va ca cao co so viet nam ) or ( chuong trinh co van va cac cay co ((oi viet) OR (cuoi viet)) nam ))) or ( chuong trinh ((cao lan) or (cao bang)) van ca cac cot n((oi viet) OR (cuoi viet)) nam ))*.