Perhaps you should try some spelling variations:
chuong trinh » cong trinh
trinh cao » trinh chao, trinh cau, tinh cao
trinh dao » trinh do, trinh da, trinh dan
cac hoat » cao hoat, cac khoan, cac thuat
trinh co » trinh do, trinh cong, trinh hoa
noi viet » hoi viet, noi tiet, doi viet
cac cot » cac cong, cac chat, cac cuoc
cao cho » cap cho, cao chat
so viet » hoc viet
dang va » dang van, dang vat, hang va
oi viet » hoi viet, o viet, cuoi viet
dao van » do van, dang van
tay co » ty co, tay o
van va » van vat, van van, ban va
cay co » cay cong
cac co » cac cong
co van » cao van, vo van, so van
cao co » co co, bao co, cao do
va ca » va cac, va cao, va cai

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 dao van va ca ((cao co) OR (cao cho)) so viet nam ) OR ( chuong trinh co van va ca ((cay co) OR (tay co)) oi viet nam ))) OR ( chuong trinh cao dang va ca ((((cac cot) OR (cac hoat))) OR (cac co)) noi viet nam ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( chuong trinh dao van va ca ((cao co) or (cao cho)) so viet nam ) or ( chuong trinh co van va ca ((cay co) or (tay co)) oi viet nam ))) or ( chuong trinh cao dang va ca ((((cac cot) OR (cac hoat))) or (cac co)) noi viet nam ))~".
• Adding a wildcard symbol may retrieve word variants: (((( chuong trinh dao van va ca ((cao co) or (cao cho)) so viet nam ) or ( chuong trinh co van va ca ((cay co) or (tay co)) oi viet nam ))) or ( chuong trinh cao dang va ca ((((cac cot) OR (cac hoat))) or (cac co)) noi viet nam ))*.