Perhaps you should try some spelling variations:
trinh nhiet » trinh thiet, trinh nghien, trinh viet
trinh dinh » trinh kinh, trinh sinh, trinh dung
cho nguoi » cua nguoi
tieng han » tieng anh
qua danh » qua dan, luan danh, luat danh
nhan hoc » nha hoc, nhan hoa, nhan thuc
than hoc » toan hoc, thai hoc, than doc

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