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
trinh co » trinh do, trinh cong, trinh hoa
noi viet » hoi viet, noi tiet, doi viet
oi viet » hoi viet, o viet, cuoi viet
cao cho » cap cho, cao chat
so viet » hoc viet
cac cot » cac cong, cac chat, cac hoat
cao lan » cao van, cao dang, cao tang
dao van » do van, dang van
cao co » co co, bao co, cao do
cac co » cac cong
lan va » luan va, lanh va, lan van
tay co » ty co, tay o
cay co » cay cong
van va » van vat, van van, ban va
co van » cao van, vo van, so van
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 lan va ca ((cac cot) 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 lan va ca ((cac cot) 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 lan va ca ((cac cot) or (cac co)) noi viet nam ))*.