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