Perhaps you should try some spelling variations:
trinh thiet » trinh viet, trinh thi
thiet luan » thien luan, thi luan, thien quan
luan nang » luan van, van nang, luan san
viet khoa » vien khoa, viec khoa, viet khoang
vien than » vien thanh, dien than, vien nhan
nang cua » mang cua, hang cua, nang dua
khoa hoc » hoa hoc
dien han » dien phan, dien than, dien dan
hien » bien, hieu, tien

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