Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh vai » thanh hai, thanh van, thanh tai
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
bao duc » dao duc, bao luc, cao duc
duc van » duc va, duc tan, duc manh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
va bao » va bai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((y nang) OR (v nang)) ((xa hoi) or (x ho)). hieu va bao duc van thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (v nang)) ((xa hoi) OR (x ho)). hieu va bao duc van thanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) OR (v nang)) ((xa hoi) or (x ho)). hieu va bao duc van thanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) OR (v nang)) ((xa hoi) or (x ho)). hieu va bao duc van thanh vai cua tre*.