Perhaps you should try some spelling variations:
trinh hien » trinh thien, trinh dien, trinh bien
hien luat » hieu luat, hieu suat
vien than » vien thanh, dien than, vien nhan
danh cua » doanh cua, manh cua, dan cua
dinh cua » dinh cuu, sinh cua, dinh cu
dien han » dien phan, dien than, dien dan
viet ha » viet nam
ha hoc » hoa hoc, nha hoc, va hoc

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 hien luat ((danh cua) OR (dinh cua)) nguoi viet ha hoc ((dien han) or (vien than))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: giao trinh hien luat ((danh cua) OR (dinh cua)) nguoi viet ha hoc ((dien han) OR (vien than)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "giao trinh hien luat ((danh cua) OR (dinh cua)) nguoi viet ha hoc ((dien han) or (vien than))".
• Adding a wildcard symbol may retrieve word variants: giao trinh hien luat ((danh cua) OR (dinh cua)) nguoi viet ha hoc ((dien han) or (vien than))*.