Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vi » hanh vi, thanh va, thanh ve
chat cuc » chat cua, chat xuc, chi cuc
tu sach » thu sach, su sach, te sach
cuc ban » cua ban, cac ban, cuu ban
va chat » van chat, va phat, cao chat
hieu va » lieu va, hieu qua
ly nang » ky nang, ly vang, ly quang
ly hang » ly quang
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, 5 hoi

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 ((ly nang) OR (ly hang)) ((x hoi) or (x ho)). hieu va chat cuc ban thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ly nang) OR (ly hang)) ((x hoi) OR (x ho)). hieu va chat cuc ban thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ly nang) OR (ly hang)) ((x hoi) or (x ho)). hieu va chat cuc ban thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ly nang) OR (ly hang)) ((x hoi) or (x ho)). hieu va chat cuc ban thanh vi cua tre*.