Perhaps you should try some spelling variations:
trinh khac » trinh khai, trinh kham, tinh khac
trinh phan » trinh han, trinh quan, thanh phan
trinh cao » trinh chao, trinh co, trinh cau
phan dang » phan dau, phan cong, nhan dan
khac luan » khau luan, khac duan, khai luan
cuoi viet » nguoi viet, co viet, nuoc viet
hai viet » thai viet, mai viet, tai viet
cao luan » cao lan, cao quan, cao xuan
dang van » hoang van, hang va
cac cau » cac mau, bac cau, ca cau
van bac » van ban, van bao, van hac
luan va » luan van, luat va
oi viet » hoi viet, o viet, gioi viet
co hai » co dai, co hoi, o hai
cau co » cau do, cay co, dau co
cac co » cac cong
tay co » ty co, cay co, tay o
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 cao luan va cac cau co hai viet nam ) or ((( cong trinh khac luan va ca ((cac co) or (tay co)) d((oi viet) or (cuoi viet)) nam ) or ( cong trinh phan dang van bac ((cac co) or (tay co)) ((oi viet) or (cuoi viet)) nam ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( cong trinh cao luan va cac cau co hai viet nam ) OR ((( cong trinh khac luan va ca ((cac co) OR (tay co)) d((oi viet) OR (cuoi viet)) nam ) OR ( cong trinh phan dang van bac ((cac co) OR (tay co)) ((oi viet) OR (cuoi viet)) nam )))).
• Adding a wildcard symbol may retrieve word variants: (( cong trinh cao luan va cac cau co hai viet nam ) or ((( cong trinh khac luan va ca ((cac co) or (tay co)) d((oi viet) or (cuoi viet)) nam ) or ( cong trinh phan dang van bac ((cac co) or (tay co)) ((oi viet) or (cuoi viet)) nam ))))*.