Perhaps you should try some spelling variations:
nam trung » nam trong, tai trung, ba trung
sach han » sach tham, sach danh, sach nang
va triet » va thiet, va trien, ve triet
han nang » phan nang, van nang, ban nang
hieu va » hieu qua
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
su sach » so sach, vu sach
vi va » vi van, vai va, vu va

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