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