Perhaps you should try some spelling variations:
trinh khau » trinh khai, trinh kham, trinh khac
trinh nhan » trinh han, trinh phan, trinh nha
nhan dang » nhan dan, phan dang, tran dang
trinh cao » trinh chao, trinh co, trinh cau
khau luan » khoa luan, phap luan, pham luan
cao luan » cao lan, cao quan, cao xuan
dang van » hoang van, hang va
dat viet » dao viet, da viet, dai viet
cong oi » cong goi, cong noi, cong soi
tac cay » tac can, tao cay, tac xay
cac cay » cac cam, cac cap, cac cach
oi viet » hoi viet, o viet, cuoi viet
luan va » luan van, luat va
cac cau » bac cau, ca cau, cac cam
cac mau » cam mau, sach mau
ca cay » cua cay, ca cac, va cay
co hoi » co hoc, co loi
co dat » coc dat, co dan, co dot
ca cao » ca dao, cu cao, ca cac

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