Perhaps you should try some spelling variations:
trinh cao » trinh chao, trinh co, trinh cau
thai viet » thi viet, tai viet, mai viet
trinh cay » trinh cau, trinh may, trinh cac
cuoi viet » nguoi viet, co viet, nuoc viet
cay lanh » cao lan, cay lam, cay dan
lanh van » lang van, anh van, lanh va
dang van » hoang van, hang va
cam cong » cac cong, cao cong, cau cong
cong noi » cong nhoi, cong goi, cong soi
noi viet » hoi viet, noi tiet, doi viet
cac cam » cad cam, cac cap, cac cau
van cac » van hac, van cau, van bac
lan van » lang van, tan van, san van
oi viet » hoi viet, o viet, gioi viet
cam co » cac co, nam co, cay co
co oi » co hoi, co loi, co doi
luan » quan

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