Perhaps you should try some spelling variations:
chuong trinh » cong trinh
trinh cao » trinh chao, trinh cau, tinh cao
cac cong » cua cong
trinh co » trinh do, trinh cong, trinh hoa
noi viet » hoi viet, noi tiet, doi viet
so viet » hoc viet
cao cho » cap cho, cao chat
dao van » dang van
cao lan » cao van, cao dang, cao tang
oi viet » hoi viet, o viet, cuoi viet
tay co » ty co, tay o
lan va » luan va, lanh va, lan van
cao do » cao dao, cau do, cap do
cay co » cay cong
do van » vo van, so van
co van » cao van, vo van, so van
van va » van vat, van van, ban va
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) OR (do van)) va ca ((cao do) 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 lan va ca ((cac cong) OR (cac co)) noi viet nam ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( chuong trinh ((dao van) OR (do van)) va ca ((cao do) 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 lan va ca ((cac cong) or (cac co)) noi viet nam ))~".
• Adding a wildcard symbol may retrieve word variants: (((( chuong trinh ((dao van) OR (do van)) va ca ((cao do) 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 lan va ca ((cac cong) or (cac co)) noi viet nam ))*.