Perhaps you should try some spelling variations:
chuong trinh » cong trinh
trinh chat » tinh chat, trinh luat, trinh han
trinh cau » trinh chao, trinh tu, trinh han
trinh cac » trinh chao, trinh cham, trinh han
hoi viet » hai viet, thai viet, cuoi viet
bang vat » bang va, dang vat, cang vat
cac van » cac dan
van cau » van dau, van hau, van chat
van cac » van hac, van bac, dan cac
cau tan » cau tao, cao tan, cau van
oi viet » o viet, cuoi viet, gioi viet
so viet » hoc viet
ban vat » ben vat, ban va, van vat
cac co » cac cong
cao co » cao cho, co co, bao co
cay co » tay co, cay cong
van va » van vat, van van, ban va
va ca » va cac, va cao, va cai

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 chat ((ban vat) or (bang vat)) ca ((cao co) OR (cac co)) hoi viet nam ) or ( chuong trinh cac van va ca ((cao co) OR (cac co)) oi viet nam ))) or ( chuong trinh cau tan ((van cac) or (van cau)) cay co so viet nam ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( chuong trinh chat ((ban vat) OR (bang vat)) ca ((cao co) OR (cac co)) hoi viet nam ) OR ( chuong trinh cac van va ca ((cao co) OR (cac co)) oi viet nam ))) OR ( chuong trinh cau tan ((van cac) OR (van cau)) cay co so viet nam )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( chuong trinh chat ((ban vat) or (bang vat)) ca ((cao co) OR (cac co)) hoi viet nam ) or ( chuong trinh cac van va ca ((cao co) OR (cac co)) oi viet nam ))) or ( chuong trinh cau tan ((van cac) or (van cau)) cay co so viet nam ))".
• Adding a wildcard symbol may retrieve word variants: (((( chuong trinh chat ((ban vat) or (bang vat)) ca ((cao co) OR (cac co)) hoi viet nam ) or ( chuong trinh cac van va ca ((cao co) OR (cac co)) oi viet nam ))) or ( chuong trinh cau tan ((van cac) or (van cau)) cay co so viet nam ))*.