Perhaps you should try some spelling variations:
nguoi viec » nguoi viet, cuoi viec, nguoi tieu
trinh viet » ninh viet, trinh vat
viet luan » vien luan, viet quan, viet tuan
doanh cua » doanh luan
viec khoa » vien khoa, viec khong, lieu khoa
vien than » vien thanh, dien than, vien nhan
danh cua » manh cua, dinh cua, dan cua
khoa hoc » hoa hoc
dien han » dien phan, dien than, dien dan

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