Perhaps you should try some spelling variations:
trinh cham » trinh chat, trinh chao, trinh han
trinh cau » trinh chat, trinh chao, trinh tu
cham anh » pham anh, pham hanh, cham binh
so viet » hoc viet
cau anh » cau danh, cau lanh, cuu anh
oi viet » hoi viet, o viet, cuoi viet
nam co » nam cao, nam so, nam lo
anh va » hanh va
cau co » cau do, cay co, dau co
cac co » cac cong

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 cau anh va cac ((nam co) OR (nam bo)) so viet nam ) OR ( cong trinh cham anh va cac ((cau co) OR (cac co)) oi viet nam ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( chuong trinh cau anh va cac ((nam co) OR (nam bo)) so viet nam ) or ( cong trinh cham anh va cac ((cau co) or (cac co)) oi viet nam ))~".
• Adding a wildcard symbol may retrieve word variants: (( chuong trinh cau anh va cac ((nam co) OR (nam bo)) so viet nam ) or ( cong trinh cham anh va cac ((cau co) or (cac co)) oi viet nam ))*.