Perhaps you should try some spelling variations:
trinh thiet » trinh viet, trinh thi
thiet qua » thien quan, hieu qua, thien quy
doanh cua » doanh luan
dien phan » dien thanh, bien phap, hien phap
dinh cua » dinh cuu, sinh cua, dinh cu
hoc dien » hoc hien, hoc vien, hoc dieu
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 ((doanh cua) or (dinh cua)) nguoi viet ha hoc dien phan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: giao trinh thiet qua ((doanh cua) OR (dinh cua)) nguoi viet ha hoc dien phan.
• Adding a wildcard symbol may retrieve word variants: giao trinh thiet qua ((doanh cua) or (dinh cua)) nguoi viet ha hoc dien phan*.