Perhaps you should try some spelling variations:
chuong trinh » cong trinh
trinh chao » trinh chat, trinh han, trinh co
trinh cau » trinh chat, trinh han, trinh tai
trinh tu » trinh ky, trinh do
so viet » hoc viet
cong so » cong san, cong hoa
cao lan » cao van, cao tang, cao bang
van cua » vang cua, ban cua, dan cua
cua tay » cua cay, cua tam, cua tap
ca cac » cua cac, va cac
lan va » luan va, lanh va, lan van
o hoi » co hoi, o hoc, o hai
o soi » mo soi, o suoi, o noi

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 lan) or (cao dang)) van cua tay ((o soi) or (o hoi)) viet nam ) or ( chuong ((((trinh cau) OR (trinh tu))) or (trinh chao)) lan va ((cu cao) or (ca cac)) cong so viet nam ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( chuong trinh ((cao lan) OR (cao dang)) van cua tay ((o soi) OR (o hoi)) viet nam ) OR ( chuong ((((trinh cau) OR (trinh tu))) OR (trinh chao)) lan va ((cu cao) OR (ca cac)) cong so viet nam )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( chuong trinh ((cao lan) or (cao dang)) van cua tay ((o soi) or (o hoi)) viet nam ) or ( chuong ((((trinh cau) OR (trinh tu))) or (trinh chao)) lan va ((cu cao) or (ca cac)) cong so viet nam ))".
• Adding a wildcard symbol may retrieve word variants: (( chuong trinh ((cao lan) or (cao dang)) van cua tay ((o soi) or (o hoi)) viet nam ) or ( chuong ((((trinh cau) OR (trinh tu))) or (trinh chao)) lan va ((cu cao) or (ca cac)) cong so viet nam ))*.