Perhaps you should try some spelling variations:
trinh chao » trinh chat, trinh han, trinh giao
chao luan » khao luan, phap luan, khau luan
trinh co » trinh do, trinh cong, trinh hoa
cong soi » cong goi, cong noi, cong nhoi
soi viet » so viet, hoi viet, oi viet
cong so » cong san, cong hoa
luan va » luan van, luat va
va cao » va dao, va bao
cac ty » cac ky, cac tu
co soi » cot soi, co so, co hoi
va co » vo co

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 ban ((va cao) or (va co)) cay ((cong soi) OR (cong so)) viet nam ) or ( cong trinh chao luan va cac ty co soi viet nam ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( cong trinh co ban ((va cao) OR (va co)) cay ((cong soi) OR (cong so)) viet nam ) OR ( cong trinh chao luan va cac ty co soi viet nam ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( cong trinh co ban ((va cao) or (va co)) cay ((cong soi) OR (cong so)) viet nam ) or ( cong trinh chao luan va cac ty co soi viet nam ))*".