Perhaps you should try some spelling variations:
trinh thiet » trinh viet, trinh thi
thiet nhuan » thien nhan, triet nhan
nhuan doanh » chuan doan, nhap doanh
doanh cua » doanh luan
viet khoa » vien khoa, viec khoa, viet khoang
dien than » dien thanh, dien toan, dien phan
vien than » vien thanh, vien nhan, viet thanh
khoa hoc » hoa hoc
dien han » dien phan, 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 nhuan doanh cua nguoi viet khoa hoc ((((dien han) OR (dien than))) OR (vien than))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "giao trinh thiet nhuan doanh cua nguoi viet khoa hoc ((((dien han) OR (dien than))) OR (vien than))".
• Adding a wildcard symbol may retrieve word variants: giao trinh thiet nhuan doanh cua nguoi viet khoa hoc ((((dien han) OR (dien than))) OR (vien than))*.