Perhaps you should try some spelling variations:
trinh thiet » trinh viet, trinh thi
viet khoang » viet hoang, viet thong, viet hang
thiet luan » thien luan, thi luan, thien quan
khoang hoc » khoang thoi, khoa hoc, hoang hoa
luan nang » luan van, van nang, luan san
vien nhan » vien than, trien nhan, vien nganh
nang cua » mang cua, hang cua, nang dua
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 nang cua nguoi viet khoang hoc ((dien han) or (vien nhan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: giao trinh thiet luan nang cua nguoi viet khoang hoc ((dien han) OR (vien nhan)).
• Adding a wildcard symbol may retrieve word variants: giao trinh thiet luan nang cua nguoi viet khoang hoc ((dien han) or (vien nhan))*.