Perhaps you should try some spelling variations:
trinh khao » trinh kham, trinh khac, trinh thao
trinh chao » trinh chat, trinh han, trinh co
trinh khai » trinh kham, trinh han, trinh tai
chao hang » cho hang, chao yang, chao mung
khao danh » cao danh, han danh, khau dan
khai danh » thai danh, khoan danh, hai anh
cach lam » thach lam, hanh lam, cap lam
oi viet » hoi viet, o viet, cuoi viet
cac lam » cap lam, cay lam, cac cam
so viet » hoc viet
cac ham » cac cam, cac hat, cac nhan
cac nam » bac nam, cac cam, cai nam
danh va » doanh va, hanh va, anh va
nam co » nam cao, nam bo, nam so
ham co » ham so, lam co
va cad » va cao, va cai, va cau
cam co » cac co, cay co, lam co
co oi » co hoi, co loi, co doi

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 chao hang va cad cam co so viet nam ) or ((((( cong trinh khao danh va cac nam co so viet nam ) or ( cong trinh khai danh va cac ham co so viet nam ))) or ( cong trinh khao danh va ((cac lam) OR (cach lam)) co oi viet nam ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( chuong trinh chao hang va cad cam co so viet nam ) OR ((((( cong trinh khao danh va cac nam co so viet nam ) OR ( cong trinh khai danh va cac ham co so viet nam ))) OR ( cong trinh khao danh va ((cac lam) OR (cach lam)) co oi viet nam ))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( chuong trinh chao hang va cad cam co so viet nam ) or ((((( cong trinh khao danh va cac nam co so viet nam ) or ( cong trinh khai danh va cac ham co so viet nam ))) or ( cong trinh khao danh va ((cac lam) OR (cach lam)) co oi viet nam ))))*".