Perhaps you should try some spelling variations:
trinh khau » trinh khai, trinh kham, trinh khac
trinh cao » trinh chao, trinh co, tinh cao
trinh cau » trinh chat, trinh chao, trinh tu
cong loai » cong lai, cong hoa, cong hai
loai viet » ngoai viet, hoa viet, luat viet
khau luan » khoa luan, phap luan, pham luan
cac cong » cua cong
cong loi » cong li, cong lon, cong goi
loi viet » hoi viet, oi viet, doi viet
cau luan » cu luan, dau luan, lau luan
cao lan » cao van, cao dang, cao tang
cac cac » cac cach, ca cac, cac bac
luan va » luan van, luat va
lan va » lanh va, lan van, lang va
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 cao lan va cac cac cong loi viet nam ) or ( cong trinh cau luan va cac cac cong loai viet nam ))) or ( cong trinh khau luan va cac cac co loi viet nam ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( cong trinh cao lan va cac cac cong loi viet nam ) OR ( cong trinh cau luan va cac cac cong loai viet nam ))) OR ( cong trinh khau luan va cac cac co loi viet nam )).
• Adding a wildcard symbol may retrieve word variants: (((( cong trinh cao lan va cac cac cong loi viet nam ) or ( cong trinh cau luan va cac cac cong loai viet nam ))) or ( cong trinh khau luan va cac cac co loi viet nam ))*.