Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, tu cach
te sach » toc sach
hieu ve » hieu va, hieu van
cao duc » dao duc, cao suc, giao duc
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
y nang » ky nang, ly nang, v nang
ve cao » va cao, ve bao, ve cac
cua te » cua tu
cua cu » cua chu, cua cau, cua su
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: ((tu sach) OR (te sach)) y nang x hoi. hieu ve cao duc va hanh va ((cua te) OR (cua cu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) y nang x hoi. hieu ve cao duc va hanh va ((cua te) or (cua cu))~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) y nang x hoi. hieu ve cao duc va hanh va ((cua te) or (cua cu))*.