Perhaps you should try some spelling variations:
trinh co » trinh do, trinh cong, trinh hoa
dot viet » dat viet, do viet, doi viet
doc viet » duoc viet, hoc viet, toc viet
cao cac » cho cac, cao cap, ca cac
luan va » luan van, luat va
co lanh » co anh, co hanh, cay lanh
lanh va » hanh va, anh va, lanh dao
lang va » lang van, hang va, lang ha
cac co » cac cong
co toi » cho toi, co hoi, co doi
va cao » va cac, va co, va dao
co loi » co hoi

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 co ((lang va) or (luan va)) cao cac ((co toi) or (co loi)) viet nam ) or ( chuong trinh co lanh va cao cac co ((dot viet) OR (doc viet)) nam ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( cong trinh co ((lang va) OR (luan va)) cao cac ((co toi) OR (co loi)) viet nam ) OR ( chuong trinh co lanh va cao cac co ((dot viet) OR (doc viet)) nam )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( cong trinh co ((lang va) or (luan va)) cao cac ((co toi) or (co loi)) viet nam ) or ( chuong trinh co lanh va cao cac co ((dot viet) OR (doc viet)) nam ))".
• Adding a wildcard symbol may retrieve word variants: (( cong trinh co ((lang va) or (luan va)) cao cac ((co toi) or (co loi)) viet nam ) or ( chuong trinh co lanh va cao cac co ((dot viet) OR (doc viet)) nam ))*.