Perhaps you should try some spelling variations:
trinh khau » trinh khai, trinh kham, trinh khac
trinh nhan » trinh han, trinh phan, trinh nha
trinh cao » trinh chao, trinh co, trinh cau
nhan dang » nhan dan, phan dang, tran dang
khau luan » khoa luan, phap luan, pham luan
mai viet » thi viet
dang van » hoang van, hang va
cao luan » cao lan, cao quan, cao xuan
hai viet » thai viet, tai viet, dai viet
dot viet » dat viet, do viet, doc viet
oi viet » hoi viet, o viet, cuoi viet
cac cac » cac cach, ca cac, cac bac
cac cay » ca cay, cac cam, cac cap
van cac » van hac, van cau, van bac
luan va » luan van, luat va
cua cay » cua cac
va cua » va chua, via cua, ca cua
cac co » cac cong
cay co » tay co, cay cong
co oi » co hoi, co loi, co doi

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 luan va cac cac co ((hai viet) or (mai viet)) nam ) or ((( cong trinh khau luan va cua cay co dot viet nam ) or ( cong trinh nhan dang van cac cay co oi viet nam ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( cong trinh cao luan va cac cac co ((hai viet) OR (mai viet)) nam ) OR ((( cong trinh khau luan va cua cay co dot viet nam ) OR ( cong trinh nhan dang van cac cay co oi viet nam )))).
• Adding a wildcard symbol may retrieve word variants: (( cong trinh cao luan va cac cac co ((hai viet) or (mai viet)) nam ) or ((( cong trinh khau luan va cua cay co dot viet nam ) or ( cong trinh nhan dang van cac cay co oi viet nam ))))*.