Perhaps you should try some spelling variations:
chuong trinh » cong trinh
trinh chat » tinh chat, trinh luat, trinh han
trinh cham » trinh chao, trinh han, trinh phan
trinh cau » trinh chao, trinh tu, trinh han
son viet » song viet, san viet, mon viet
bac nam » bac am, ban nam, bau nam
so viet » hoc viet
cau anh » cau danh, cau lanh, cuu anh
cao cau » cao cap, co cau, tao cau
anh va » hanh va
va bac » van bac, va cac, va bai
nam co » nam cao, nam bo, nam so
va cao » va cac, va co, va dao
do son » dong son

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 cau anh va bac nam co so viet nam ) or ( cong ((trinh cham) or (trinh chat)) anh va cao cau do son viet nam ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( chuong trinh cau anh va bac nam co so viet nam ) OR ( cong ((trinh cham) OR (trinh chat)) anh va cao cau do son viet nam )).
• Adding a wildcard symbol may retrieve word variants: (( chuong trinh cau anh va bac nam co so viet nam ) or ( cong ((trinh cham) or (trinh chat)) anh va cao cau do son viet nam ))*.