Perhaps you should try some spelling variations:
trinh thiet » trinh viet, trinh thi
luan thanh » quan thanh, xuan thanh, quang thanh
luan danh » luan van, luan nang, luan san
viet khoa » vien khoa, viec khoa, viet khoang
bien phap » ban phap
vien than » vien thanh, dien than, vien nhan
khoa hoc » hoa 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 ((luan danh) OR (luan thanh)) cua nguoi viet khoa hoc ((bien phap) or (vien than))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: giao trinh thiet ((luan danh) OR (luan thanh)) cua nguoi viet khoa hoc ((bien phap) OR (vien than)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "giao trinh thiet ((luan danh) OR (luan thanh)) cua nguoi viet khoa hoc ((bien phap) or (vien than))".
• Adding a wildcard symbol may retrieve word variants: giao trinh thiet ((luan danh) OR (luan thanh)) cua nguoi viet khoa hoc ((bien phap) or (vien than))*.