Perhaps you should try some spelling variations:
trinh cao » trinh chao, trinh co, trinh cau
thai viet » thi viet, tai viet, mai viet
trinh sau » trinh san, trinh cau, trinh su
hai viet » mai viet, tai viet, dai viet
sau luan » su luan, dau luan, sau lan
soi viet » hoi viet, oi viet, doi viet
cau xay » cau giay
cao van » cac van, dao van, cao dang
luan va » luan van, luat va
so viet » hoc viet
co soi » cot soi, co hoi, co loi
xay co » tay co, lay co
ca cay » cua cay, cac cay, ca cac
cay co » cac co, tay co, cay cong
va cau » van cau, va cac, va dau
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: (( cong trinh cao van va cau xay co soi viet nam ) or ((( chuong trinh sau luan va ca cay co ((hai viet) OR (thai viet)) nam ) or ( chuong trinh sau luan va ca cay co so viet nam ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( cong trinh cao van va cau xay co soi viet nam ) OR ((( chuong trinh sau luan va ca cay co ((hai viet) OR (thai viet)) nam ) OR ( chuong trinh sau luan va ca cay co so viet nam )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( cong trinh cao van va cau xay co soi viet nam ) or ((( chuong trinh sau luan va ca cay co ((hai viet) OR (thai viet)) nam ) or ( chuong trinh sau luan va ca cay co so viet nam ))))".
• Adding a wildcard symbol may retrieve word variants: (( cong trinh cao van va cau xay co soi viet nam ) or ((( chuong trinh sau luan va ca cay co ((hai viet) OR (thai viet)) nam ) or ( chuong trinh sau luan va ca cay co so viet nam ))))*.