Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
bao duc » dao duc, bao luc, cao duc
va hanh » van hanh, va thanh, va danh
luu tre » luu tru, cuu tre, luy tre
ve bao » te bao, va bao
vi luu » vi lua
x hoi » o hoi, 5 hoi

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: so sach ky nang ((((x hoi) OR (x ho))) OR (xa hoi)). hieu ve bao duc va hanh vi luu tre~.
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ((((x hoi) or (x ho))) or (xa hoi)). hieu ve bao duc va hanh vi luu tre*.