Perhaps you should try some spelling variations:
trinh pham » trinh phan, trinh phap, trinh cham
trinh nhan » trinh han, trinh phan, trinh nha
pham luan » phap luan, pham quang, pham van
nhan dang » nhan dan, phan dang, tran dang
trinh cao » trinh chao, trinh co, trinh cau
cuoi viet » nguoi viet, co viet, nuoc viet
dot viet » dat viet, do viet, doc viet
cao luan » cao lan, cao quan, cao xuan
dang van » hoang van, hang va
co cuoi » co nuoi, cho cuoc, co nguoi
cac mau » cam mau, sach mau
van cac » van hac, van cau, van bac
luan va » luan van, luat va
cac cau » bac cau, cac cam, cac cap
cac cac » cac cach, ca cac, cac bac
co hai » co hoi, o hai, so hai
co dai » co dan, do dai
ca cau » can cau, cua cau, ca cac
cac co » cac cong
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) or (ca cau))) or (cac mau)) ((co hai) OR (co dai)) viet nam ) or ((( cong trinh pham luan ((va ca) or (va cac)) cac co dot viet nam ) or ( cong trinh nhan dang van cac cac co cuoi viet nam ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( cong trinh cao luan va ((((cac cau) OR (ca cau))) OR (cac mau)) ((co hai) OR (co dai)) viet nam ) OR ((( cong trinh pham luan ((va ca) OR (va cac)) cac co dot viet nam ) OR ( cong trinh nhan dang van cac cac co cuoi viet nam )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( cong trinh cao luan va ((((cac cau) or (ca cau))) or (cac mau)) ((co hai) OR (co dai)) viet nam ) or ((( cong trinh pham luan ((va ca) or (va cac)) cac co dot viet nam ) or ( cong trinh nhan dang van cac cac co cuoi viet nam ))))".
• Adding a wildcard symbol may retrieve word variants: (( cong trinh cao luan va ((((cac cau) or (ca cau))) or (cac mau)) ((co hai) OR (co dai)) viet nam ) or ((( cong trinh pham luan ((va ca) or (va cac)) cac co dot viet nam ) or ( cong trinh nhan dang van cac cac co cuoi viet nam ))))*.