Perhaps you should try some spelling variations:
trinh thien » trinh thiet, trinh tien, trinh nghien
thien luan » thien quan, thien van, hien luat
viet khoa » vien khoa, viec khoa, viet khoang
bien phap » ban phap
vien than » vien thanh, dien than, vien nhan
khoa hoc » hoa hoc
van cua » vang cua, ban cua, dan cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: giao trinh thien luan van cua nguoi viet khoa hoc ((bien phap) or (vien than))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: giao trinh thien luan van cua nguoi viet khoa hoc ((bien phap) OR (vien than)).
• Adding a wildcard symbol may retrieve word variants: giao trinh thien luan van cua nguoi viet khoa hoc ((bien phap) or (vien than))*.