Perhaps you should try some spelling variations:
trinh nhiet » trinh thiet, trinh nghien, trinh viet
trinh hieu » trinh dieu, trinh thiet, trinh thien
cho nguoi » cua nguoi
tieng han » tieng anh
qua danh » qua dan, luan danh, luat danh
nma hoc » nhan hoc
nha hoc » nha thuoc, khoa hoc, nha nuoc

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