Perhaps you should try some spelling variations:
trinh thiet » trinh viet, trinh thi
thiet qua » thien quan, hieu qua, thien quy
vien than » vien thanh, dien than, vien nhan
danh cua » doanh cua, dinh cua, dan cua
manh cua » doanh cua, ban cua
dien dan » hien dai, vien dai, gian 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 thiet qua ((danh cua) or (manh cua)) nguoi viet ha hoc ((dien dan) or (vien than))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: giao trinh thiet qua ((danh cua) OR (manh cua)) nguoi viet ha hoc ((dien dan) OR (vien than)).
• Adding a wildcard symbol may retrieve word variants: giao trinh thiet qua ((danh cua) or (manh cua)) nguoi viet ha hoc ((dien dan) or (vien than))*.