Perhaps you should try some spelling variations:
nam trung » nam trong, tai trung, ba trung
cua triet » cua viet, su triet, va triet
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
hieu ve » hieu va, hieu van
sach v » sach va, sach y, sach vay
sach 2 » sach y
vi cua » vai cua, di cua
ve nam » he nam, va nam, le nam
x hoi » xa hoi, o hoi, x ho

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: su ((sach v) OR (sach 2)) nang x hoi. hieu ve nam trung ((va hanh) OR (va danh)) vi cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach v) or (sach 2)) nang x hoi. hieu ve nam trung ((va hanh) OR (va danh)) vi cua triet~".
• Adding a wildcard symbol may retrieve word variants: su ((sach v) or (sach 2)) nang x hoi. hieu ve nam trung ((va hanh) OR (va danh)) vi cua triet*.