Perhaps you should try some spelling variations:
thanh vai » thanh van, thanh tai, thanh oai
thanh hai » thanh phan, thanh hoa, thanh san
thu sach » tu sach, thuat sach, thuoc sach
dao duc » giao duc, tao duoc
cua tre » cua te, cuu tre, cua triet
cao duc » cao suc, giao duc, tao duoc
hieu va » lieu va, hieu qua
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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 y nang o hoi. hieu va ((cao duc) or (dao duc)) van ((thanh vai) OR (thanh hai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang o hoi. hieu va ((cao duc) OR (dao duc)) van ((thanh vai) OR (thanh hai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang o hoi. hieu va ((cao duc) or (dao duc)) van ((thanh vai) OR (thanh hai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang o hoi. hieu va ((cao duc) or (dao duc)) van ((thanh vai) OR (thanh hai)) cua tre*.