Perhaps you should try some spelling variations:
trinh nhiet » trinh thiet, trinh nghien, trinh viet
nhiet qua » nhiet cua, hieu qua, khien qua
cho nguoi » cua nguoi
tieng han » tieng anh
qua dac » quan dac, qua cac, qua da
dac cho » day cho, danh cho
nha hoc » nha thuoc, khoa hoc, thai hoc

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 nhiet qua dac cho nguoi viet ((nha hoc) OR (nha nuoc)) tieng han~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "giao trinh nhiet qua dac cho nguoi viet ((nha hoc) OR (nha nuoc)) tieng han".
• Adding a wildcard symbol may retrieve word variants: giao trinh nhiet qua dac cho nguoi viet ((nha hoc) OR (nha nuoc)) tieng han*.