Perhaps you should try some spelling variations:
trinh hieu » trinh dieu, trinh thiet, trinh nhiet
hieu luat » hieu qua
nguoi van » nguoi san, nguoi dan, nguoi va
hien huan » hien thuan, hien quan, tien huan
dan cua » dan ca, ban cua, day cua
nam hoc » nam moc, am hoc, nam ho
nam hoi » nam khoa

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: giao trinh hieu luat ((dan cua) OR (dai cua)) nguoi van ((nam hoc) OR (nam hoi)) hien huan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "giao trinh hieu luat ((dan cua) or (dai cua)) nguoi van ((nam hoc) OR (nam hoi)) hien huan~".
• Adding a wildcard symbol may retrieve word variants: giao trinh hieu luat ((dan cua) or (dai cua)) nguoi van ((nam hoc) OR (nam hoi)) hien huan*.