Perhaps you should try some spelling variations:
trinh cham » trinh chat, trinh chao, trinh han
trinh cau » trinh chat, trinh chao, trinh tu
hoi viet » hai viet, oi viet, thai viet
cau danh » cao danh, chuc danh, nam danh
mai viet » thi viet
cay doan » cay xoan, chan doan, vay doanh
cham anh » pham anh, pham hanh, cham binh
dai viet » dao viet, tai viet, da viet
cac cau » cac mau, bac cau, ca cau
danh va » doanh va, hanh va, dan va
cay dan » cac dan, ca dan, cay lanh
do dai » co dai
anh va » hanh va
cap co » cap cho, cap do, cac co
o mai » o lai, o hai, o tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( cong trinh ((cay doan) or (cay dan)) va cac ((cap co) OR (tap co)) hoi viet nam ) or ((( chuong trinh cham anh va ((cao cap) or (cao chat)) o mai viet nam ) or ( chuong trinh cau danh va cac cau do dai viet nam ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( cong trinh ((cay doan) OR (cay dan)) va cac ((cap co) OR (tap co)) hoi viet nam ) OR ((( chuong trinh cham anh va ((cao cap) OR (cao chat)) o mai viet nam ) OR ( chuong trinh cau danh va cac cau do dai viet nam )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( cong trinh ((cay doan) or (cay dan)) va cac ((cap co) OR (tap co)) hoi viet nam ) or ((( chuong trinh cham anh va ((cao cap) or (cao chat)) o mai viet nam ) or ( chuong trinh cau danh va cac cau do dai viet nam ))))".
• Adding a wildcard symbol may retrieve word variants: (( cong trinh ((cay doan) or (cay dan)) va cac ((cap co) OR (tap co)) hoi viet nam ) or ((( chuong trinh cham anh va ((cao cap) or (cao chat)) o mai viet nam ) or ( chuong trinh cau danh va cac cau do dai viet nam ))))*.