Perhaps you should try some spelling variations:
trinh hieu » trinh dieu, trinh thiet, trinh nhiet
trien nhan » trien nha, tri nhan, trien khai
vien nhan » vien than, vien nganh, vien thanh
qua dinh » qua kinh, quy dinh, qua danh
dinh cua » dinh cuu, sinh cua, dinh cu
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 hieu qua dinh cua nguoi viet ha hoc ((vien nhan) or (trien nhan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: giao trinh hieu qua dinh cua nguoi viet ha hoc ((vien nhan) OR (trien nhan)).
• Adding a wildcard symbol may retrieve word variants: giao trinh hieu qua dinh cua nguoi viet ha hoc ((vien nhan) or (trien nhan))*.