Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
thanh ve » thanh va, thanh vien, thanh van
sach ky » sac ky, sach y, sach ty
hanh ve » hanh vi, hanh va, hanh kem
cua tre » cua te, cuu tre, cua triet
cao duc » dao duc, cao suc, tao duoc
hieu va » lieu va, hieu qua
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: thu sach ky nang x hoi. hieu va ((cao duc) or (giao duc)) ban ((thanh ve) OR (hanh ve)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang x hoi. hieu va ((cao duc) OR (giao duc)) ban ((thanh ve) OR (hanh ve)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang x hoi. hieu va ((cao duc) or (giao duc)) ban ((thanh ve) OR (hanh ve)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. hieu va ((cao duc) or (giao duc)) ban ((thanh ve) OR (hanh ve)) cua tre*.