Perhaps you should try some spelling variations:
trinh thiet » trinh viet, trinh thi
thiet luan » thien luan, thi luan, thien quan
luan tang » luan nang, lan tang, xuan trang
viet khoa » vien khoa, viec khoa, viet khoang
vien nhan » vien than, trien nhan, vien nganh
tang cua » mang cua, hang cua, tang luan
khoa hoc » hoa hoc
dien han » dien phan, dien than, dien dan
vien dai » hien dai

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 tang cua nguoi viet khoa hoc ((((dien han) or (vien dai))) or (vien nhan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: giao trinh thiet luan tang cua nguoi viet khoa hoc ((((dien han) OR (vien dai))) OR (vien nhan)).
• Adding a wildcard symbol may retrieve word variants: giao trinh thiet luan tang cua nguoi viet khoa hoc ((((dien han) or (vien dai))) or (vien nhan))*.