Perhaps you should try some spelling variations:
trinh thiet » trinh viet, trinh thi
thiet luan » thien luan, thi luan, thien quan
nguoi tien » nguoi tieu, nguoi tiep, nguoi stieng
vien thanh » viet thanh, tien thanh, dien thanh
luan danh » luan thanh, luan van, luan nang
tien khoa » tien khoan, trien khoa, tien hoa
danh cua » doanh cua, manh cua, dinh cua
khoa hoc » hoa hoc
dien dan » hien dai, vien dai, gian dan

You may be able to get more results by adjusting your search query.

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