Perhaps you should try some spelling variations:
trinh cao » trinh chao, trinh co, tinh cao
trinh cau » trinh chat, trinh chao, trinh tu
soi viet » hoi viet, oi viet, doi viet
hai viet » thai viet, mai viet, tai viet
cau luan » cu luan, dau luan, lau luan
cau giay » cuu giai, cac giai
cao van » cac van, dao van, cao dang
van bao » van ban, van dao
bao cay » bao xay, tao cay, bao tay
so viet » hoc viet
co soi » cot soi, co hoi, co loi
cao so » cao son, cao su, cao do
so hai » son hai, su hai, so ha
van va » van vat, van van, ban va
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 van va ((cau xay) or (cau giay)) co soi viet nam ) or ((( chuong trinh cau luan van bao cao so hai viet nam ) or ( chuong trinh cau luan van bao cay co so viet nam ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( cong trinh cao van va ((cau xay) OR (cau giay)) co soi viet nam ) OR ((( chuong trinh cau luan van bao cao so hai viet nam ) OR ( chuong trinh cau luan van bao cay co so viet nam )))).
• Adding a wildcard symbol may retrieve word variants: (( cong trinh cao van va ((cau xay) or (cau giay)) co soi viet nam ) or ((( chuong trinh cau luan van bao cao so hai viet nam ) or ( chuong trinh cau luan van bao cay co so viet nam ))))*.