Perhaps you should try some spelling variations:
trinh thiet » trinh viet, trinh thi
thiet luan » thien luan, thi luan, thien quan
luan doanh » luat doanh, luan danh, nhuan doanh
doanh cua » doanh luan
viet khoa » vien khoa, viec khoa, viet khoang
dien phan » dien thanh, bien phap, hien phap
vien than » vien thanh, dien than, vien nhan
khoa hoc » hoa hoc
dien han » dien than, dien dan, dien ban

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 thiet luan doanh cua nguoi viet khoa hoc ((((dien han) OR (dien phan))) or (vien than))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: giao trinh thiet luan doanh cua nguoi viet khoa hoc ((((dien han) OR (dien phan))) OR (vien than)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "giao trinh thiet luan doanh cua nguoi viet khoa hoc ((((dien han) OR (dien phan))) or (vien than))".
• Adding a wildcard symbol may retrieve word variants: giao trinh thiet luan doanh cua nguoi viet khoa hoc ((((dien han) OR (dien phan))) or (vien than))*.