Perhaps you should try some spelling variations:
va thieu » va thiet, va hieu, va tieu
nam thuc » nam thuoc, am thuc, nam thu
dao lang » dao khang, dao quang, dao trang
va triet » va thiet, va trien, ve triet
hanh vai » hanh vi, hanh va, hanh tai
sach dao » lanh dao
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
hieu ve » hieu van
lang xa » lang ha, dang xay, lang van

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 dao lang xa hoi. ((hieu ve) OR (hieu va)) nam thuc va hanh vai ((va triet) OR (va thieu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach dao lang xa hoi. ((hieu ve) OR (hieu va)) nam thuc va hanh vai ((va triet) or (va thieu))~".
• Adding a wildcard symbol may retrieve word variants: su sach dao lang xa hoi. ((hieu ve) OR (hieu va)) nam thuc va hanh vai ((va triet) or (va thieu))*.