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