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

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 vi ((va triet) OR (ve 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 vi ((va triet) OR (ve triet))~".
• Adding a wildcard symbol may retrieve word variants: su sach han nang xa hoi. ((hieu va) or (lieu va)) nam trung va hanh vi ((va triet) OR (ve triet))*.