Perhaps you should try some spelling variations:
trinh thiet » trinh viet, trinh thi
luat danh » luat doanh, luat dan, luat canh
vien than » vien thanh, dien than, vien nhan
qua danh » qua dan, luan danh, quoc danh
viet nha » viet nhat, viet ha, viec nha
dien han » dien phan, dien than, dien dan
nha hoc » nha thuoc, khoa hoc, nha nuoc

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