Perhaps you should try some spelling variations:
chuong trinh » cong trinh
trinh cau » trinh chat, trinh chao, trinh tu
luat ban » luat bao, luat dan, luat bat
so viet » hoc viet
cac cay » cac cam, cac cap, cac cau
van cac » van hac, van cau, van bac
tan van » tran van, tang van, luan van
cau tan » cau tao, cao tan, cau van
ban vat » bang vat, ben vat, ban va
oi viet » hoi viet, cuoi viet, gioi viet
o viet » hoc viet
ca cay » cua cay, ca cac, ca cao
cay co » cac co, tay co, cay cong
vat ca » vat cua, vat va, vat co
va ca » va cac, va cao, va cai
co h » cao h, co ho, co _

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 luat ban vat ca cay co h((oi viet) OR (o viet)) nam ) OR ( chuong trinh ((cac van) OR (cac dan)) va ca cay co ((oi viet) OR (o viet)) nam ))) OR ( chuong trinh cau tan van cac cay co so viet nam ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( chuong trinh luat ban vat ca cay co h((oi viet) or (o viet)) nam ) or ( chuong trinh ((cac van) OR (cac dan)) va ca cay co ((oi viet) or (o viet)) nam ))) or ( chuong trinh cau tan van cac cay co so viet nam ))~".
• Adding a wildcard symbol may retrieve word variants: (((( chuong trinh luat ban vat ca cay co h((oi viet) or (o viet)) nam ) or ( chuong trinh ((cac van) OR (cac dan)) va ca cay co ((oi viet) or (o viet)) nam ))) or ( chuong trinh cau tan van cac cay co so viet nam ))*.