Perhaps you should try some spelling variations:
trinh hieu » trinh dieu, trinh thiet, trinh nhiet
nguoi binh » nguoi kinh, nguoi lanh
nguoi ban » nguoi san, nguoi dan, nguoi ba
hoc tieng » hoc hien
tieng han » tieng anh
qua danh » qua dan, luan danh, luat danh
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 qua danh cho ((((nguoi binh) OR (nguoi ban))) or (nguoi benh)) nha hoc tieng han~.
• If you are trying to use Boolean operators, they must be ALL CAPS: giao trinh hieu qua danh cho ((((nguoi binh) OR (nguoi ban))) OR (nguoi benh)) nha hoc tieng han.
• The words AND, OR and NOT may confuse the search; try adding quotes: "giao trinh hieu qua danh cho ((((nguoi binh) OR (nguoi ban))) or (nguoi benh)) nha hoc tieng han".
• Adding a wildcard symbol may retrieve word variants: giao trinh hieu qua danh cho ((((nguoi binh) OR (nguoi ban))) or (nguoi benh)) nha hoc tieng han*.