Perhaps you should try some spelling variations:
trinh thien » trinh thiet, trinh tien, trinh nghien
thien qua » thien quan, thien quy, khien qua
qua doanh » cua doanh, qua danh, luat doanh
doanh cua » doanh luan
viet khoa » vien khoa, viec khoa, viet khoang
vien than » vien thanh, vien nhan, viet thanh
dien than » dien thanh, dien toan, dien phan
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 thien qua doanh cua nguoi viet khoa hoc ((dien han) or (((vien than) or (dien than))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: giao trinh thien qua doanh cua nguoi viet khoa hoc ((dien han) OR (((vien than) OR (dien than)))).
• Adding a wildcard symbol may retrieve word variants: giao trinh thien qua doanh cua nguoi viet khoa hoc ((dien han) or (((vien than) or (dien than))))*.