Perhaps you should try some spelling variations:
trinh chao » trinh chat, trinh han, trinh giao
trinh cho » trinh chat, trinh cham, trinh khoa
trinh cay » trinh bay, trinh cam, trinh cao
trinh cac » trinh chat, trinh cham, trinh han
trinh may » trinh ky, trinh han, trinh ly
trinh cau » trinh chat, trinh tu, trinh han
trinh co » trinh do, trinh cong, trinh hoa
dai viet » mai viet, dao viet, tai viet
lanh van » lang van, anh van, lanh va
so viet » hoc viet
co hang » cho hang, co chang, co hoang
oi viet » hoi viet, o viet, cuoi viet
van cac » van hac, van cau, van bac
cam co » cac co, cay co, lam co
lan va » luan va, lanh va, lan van
nam co » nam cao, nam bo, nam so
ng so » ngu so

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 cho) or (trinh cau)) lan va cac ((cam co) OR (nam co)) dai viet nam ) or ( cong ((((trinh cay) or (trinh may))) or (((trinh cac) or (trinh chao)))) lanh van cac ((cam co) OR (nam co)) oi viet nam ))) or ( cong trinh co hang va cac ((cam co) OR (nam co))ng so viet nam ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( cong ((trinh cho) OR (trinh cau)) lan va cac ((cam co) OR (nam co)) dai viet nam ) OR ( cong ((((trinh cay) OR (trinh may))) OR (((trinh cac) OR (trinh chao)))) lanh van cac ((cam co) OR (nam co)) oi viet nam ))) OR ( cong trinh co hang va cac ((cam co) OR (nam co))ng so viet nam )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( cong ((trinh cho) or (trinh cau)) lan va cac ((cam co) OR (nam co)) dai viet nam ) or ( cong ((((trinh cay) or (trinh may))) or (((trinh cac) or (trinh chao)))) lanh van cac ((cam co) OR (nam co)) oi viet nam ))) or ( cong trinh co hang va cac ((cam co) OR (nam co))ng so viet nam ))".
• Adding a wildcard symbol may retrieve word variants: (((( cong ((trinh cho) or (trinh cau)) lan va cac ((cam co) OR (nam co)) dai viet nam ) or ( cong ((((trinh cay) or (trinh may))) or (((trinh cac) or (trinh chao)))) lanh van cac ((cam co) OR (nam co)) oi viet nam ))) or ( cong trinh co hang va cac ((cam co) OR (nam co))ng so viet nam ))*.