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 nang » viet hoang, viet trang, viet nam
hien huan » hien thuan, hien quan, tien huan
nang hoc » nang doc, nang luc, dong 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)) ((cho nguoi) or (cua nguoi)) viet nang hoc hien huan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: giao trinh thiet ((luan danh) OR (luan thanh)) ((cho nguoi) OR (cua nguoi)) viet nang hoc hien huan.
• The words AND, OR and NOT may confuse the search; try adding quotes: "giao trinh thiet ((luan danh) OR (luan thanh)) ((cho nguoi) or (cua nguoi)) viet nang hoc hien huan".
• Adding a wildcard symbol may retrieve word variants: giao trinh thiet ((luan danh) OR (luan thanh)) ((cho nguoi) or (cua nguoi)) viet nang hoc hien huan*.