Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh via » hanh vi, hanh va, anh va
vuc nang » cuc nang, vu nang, chuc nang
via cua » gia cua, gian cua, giau cua
va hanh » van hanh, va thanh, va danh
cao duc » dao duc, cao suc, giao duc
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
va cao » va cac, va co, va dao
y nang » ky nang, ly nang, v nang
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) OR (toc sach)) ((y nang) or (vuc nang)) x hoi. hieu va cao duc va hanh via cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ((y nang) OR (vuc nang)) x hoi. hieu va cao duc va hanh via cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ((y nang) or (vuc nang)) x hoi. hieu va cao duc va hanh via cua tre*".