Perhaps you should try some spelling variations:
trinh cao » trinh chao, trinh cau, tinh cao
trinh do » trinh ky
trinh co » trinh cong, trinh hoa, trinh ky
doi viet » dai viet, hoi viet, doc viet
noi viet » hoi viet, noi tiet, nhi viet
caoc tac » cac tac, cao tai, canh tac
va caoc » va cuoc, va cao
do viet » dao viet, so viet, o viet
oi viet » hoi viet, o viet, cuoi viet
co dang » co dan, co dong, xo dang
do dang » da dang, do danh, xo dang
cac cay » ca cay, cac cam, cac cap
dang va » dang van, dang vat, hang va
bo noi » bo doi, o noi, so noi
cay bo » can bo, cay co, cac bo
tac co » tuc co, cac co, toc co
dao co » dao cao, dao cho, dao o
co oi » co hoi, co loi, co doi
va ca » va cao, va cai, va cau

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 do dang va caoc tac co oi viet nam ) or ( cong trinh co dang va ca dao co ((doi viet) OR (do viet)) nam ))) or ( cong trinh cao dang va cac cay bo noi viet nam ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( cong trinh do dang va caoc tac co oi viet nam ) OR ( cong trinh co dang va ca dao co ((doi viet) OR (do viet)) nam ))) OR ( cong trinh cao dang va cac cay bo noi viet nam )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( cong trinh do dang va caoc tac co oi viet nam ) or ( cong trinh co dang va ca dao co ((doi viet) OR (do viet)) nam ))) or ( cong trinh cao dang va cac cay bo noi viet nam ))".
• Adding a wildcard symbol may retrieve word variants: (((( cong trinh do dang va caoc tac co oi viet nam ) or ( cong trinh co dang va ca dao co ((doi viet) OR (do viet)) nam ))) or ( cong trinh cao dang va cac cay bo noi viet nam ))*.