Perhaps you should try some spelling variations:
trinh hieu » trinh dieu, trinh thiet, trinh nhiet
cho nguoi » cua nguoi
tien duan » tien dua, tien quang, dien dan
tien huan » hien huan, tieu chuan, hien thuan
nang hoc » nang doc, nang luc, dong hoc
qua dan » qua danh, qua ban, cua dan
dan cho » danh cho, san cho, dac cho

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 hieu qua dan cho nguoi viet ((dai hoc) or (nang hoc)) ((tien duan) OR (tien huan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: giao trinh hieu qua dan cho nguoi viet ((dai hoc) OR (nang hoc)) ((tien duan) OR (tien huan)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "giao trinh hieu qua dan cho nguoi viet ((dai hoc) or (nang hoc)) ((tien duan) OR (tien huan))".
• Adding a wildcard symbol may retrieve word variants: giao trinh hieu qua dan cho nguoi viet ((dai hoc) or (nang hoc)) ((tien duan) OR (tien huan))*.