Perhaps you should try some spelling variations:
trinh viet » ninh viet, trinh vat
nguoi lieu » nguoi tieu, nguoi dieu, nguoi thieu
luan danh » luan thanh, luan nang, luan san
vien than » vien thanh, dien than, vien nhan
lieu hoc » lieu khoa, li hoc
dien han » dien phan, dien than, dien dan
hoc hoc » hoc hoa, toc hoc, hoc hoi

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 ((luan danh) or (luan van)) cua nguoi lieu hoc hoc ((dien han) or (vien than))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: giao trinh viet ((luan danh) OR (luan van)) cua nguoi lieu hoc hoc ((dien han) OR (vien than)).
• Adding a wildcard symbol may retrieve word variants: giao trinh viet ((luan danh) or (luan van)) cua nguoi lieu hoc hoc ((dien han) or (vien than))*.