Perhaps you should try some spelling variations:
trinh thiet » trinh viet, trinh thi
thiet luan » thien luan, thi luan, thien quan
vien thanh » viet thanh, tien thanh, dien thanh
luan manh » luan danh, luan anh, luan mach
viet khoa » vien khoa, viec khoa, viet khoang
vien than » dien than, vien nhan, viet thanh
manh cua » doanh cua, ban cua
khoa hoc » hoa hoc
dien han » dien phan, dien than, dien dan

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