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
dot viet » dat viet, do viet, doc viet
dang van » hoang van, hang va
hai viet » thai viet, mai viet, tai viet
cao luan » cao lan, cao quan, cao xuan
cua cau » chua cau, cua cac, cua chu
cac cam » cad cam, cac cap, cac ham
cac cay » cac cap, tac cay, cac cach
cac cau » bac cau, ca cau, cac cap
o nguoi » _ nguoi, cho nguoi, con nguoi
cac mau » cam mau, sach mau
ca cay » cua cay, ca cac, ca cao
van ca » van cau, van cua, dan ca
co hai » co dai, co hoi, o hai
cay co » cac co, tay co, cay cong

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 van ((((cac cau) or (cua cau))) or (cac mau)) co hai viet nam ) or ((( cong trinh khau luan van ca cay co dot viet nam ) or ( cong trinh nhan dang van ((cac cay) OR (cac cam)) o nguoi viet nam ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( cong trinh cao luan van ((((cac cau) OR (cua cau))) OR (cac mau)) co hai viet nam ) OR ((( cong trinh khau luan van ca cay co dot viet nam ) OR ( cong trinh nhan dang van ((cac cay) OR (cac cam)) o nguoi viet nam )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( cong trinh cao luan van ((((cac cau) or (cua cau))) or (cac mau)) co hai viet nam ) or ((( cong trinh khau luan van ca cay co dot viet nam ) or ( cong trinh nhan dang van ((cac cay) OR (cac cam)) o nguoi viet nam ))))".
• Adding a wildcard symbol may retrieve word variants: (( cong trinh cao luan van ((((cac cau) or (cua cau))) or (cac mau)) co hai viet nam ) or ((( cong trinh khau luan van ca cay co dot viet nam ) or ( cong trinh nhan dang van ((cac cay) OR (cac cam)) o nguoi viet nam ))))*.