Perhaps you should try some spelling variations:
trinh thiet » trinh viet, trinh thi
trinh hieu » trinh dieu, trinh nhiet, trinh thien
cho nguoi » cua nguoi
tien duan » tien dua, tien huan, tien quang
nami hoc » dai hoc, bai hoc, nam hoi
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) OR (trinh thiet)) qua dan cho nguoi viet ((nami hoc) or (nang hoc)) tien duan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: giao ((trinh hieu) OR (trinh thiet)) qua dan cho nguoi viet ((nami hoc) OR (nang hoc)) tien duan.
• The words AND, OR and NOT may confuse the search; try adding quotes: "giao ((trinh hieu) OR (trinh thiet)) qua dan cho nguoi viet ((nami hoc) or (nang hoc)) tien duan".
• Adding a wildcard symbol may retrieve word variants: giao ((trinh hieu) OR (trinh thiet)) qua dan cho nguoi viet ((nami hoc) or (nang hoc)) tien duan*.