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

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 ((nam hoi) or (nang hoc)) tien duan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: giao trinh hieu qua dan cho nguoi viet ((nam hoi) OR (nang hoc)) tien duan.
• Adding a wildcard symbol may retrieve word variants: giao trinh hieu qua dan cho nguoi viet ((nam hoi) or (nang hoc)) tien duan*.