Perhaps you should try some spelling variations:
chuong trinh » cong trinh
trinh cao » trinh chao, trinh co, tinh cao
trinh cau » trinh chat, trinh chao, trinh tu
cong hoi » cong nhoi, cong hoa, cong hai
cay cong » cac cong, cao cong, cau cong
hoi viet » hai viet, oi viet, thai viet
so viet » hoc viet
cua cay » cua cac
van cua » vang cua, ban cua, dan cua
cau lan » cau lanh, cao lan, sau lan
tan van » tran van, tang van, luan van
cao tan » cao tang, cao tai, cao van
cay co » cac co, tay co
lan va » luan va, lanh va, lan van
ca cay » cac cay, ca cac, ca cao
va ca » va cac, va cao, va cai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( chuong trinh cao tan van cua cay co so viet nam ) or ( chuong trinh cau lan va ca cay cong hoi viet nam ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( chuong trinh cao tan van cua cay co so viet nam ) OR ( chuong trinh cau lan va ca cay cong hoi viet nam )).
• Adding a wildcard symbol may retrieve word variants: (( chuong trinh cao tan van cua cay co so viet nam ) or ( chuong trinh cau lan va ca cay cong hoi viet nam ))*.