Perhaps you should try some spelling variations:
chuong trinh » cong trinh
trinh sau » trinh san, trinh su, trinh mau
trinh cau » trinh chat, trinh chao, trinh tu
hoi viet » hai viet, oi viet, thai viet
loi viet » loai viet, oi viet, doi viet
cao cap » cao chat
van cao » van dao, van bao, van hao
tan van » tran van, tang van, luan van
sau tan » sau tang, sau lan, sau tai
cao cac » cho cac, ca cac, co cac
cau lan » cau lanh, cao lan, sau lan
do hoi » do choi, do hoai, do thoi
cap do » cau do
lan va » luan va, lanh va, lan van
va cao » va cac, va co, va dao
cap co » cap cho, tap co, cac co

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