Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
chat xuc » chat huu, cam xuc, chao xu
thanh vi » hanh vi, thanh va, thanh ve
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cua triet, dua tren
xuc ban » duc ban, cuc ban, quoc ban
tu sach » thu sach, su sach, te sach
va chat » van chat, va phat, cao chat
hieu va » lieu va, hieu qua
ty nang » ky nang, ty xang, ty hang
cuu tre » cau tren, cau treo
x hoi » o hoi, x ho, 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 ty nang ((x hoi) or (xa hoi)). hieu va chat xuc ban thanh vi ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((x hoi) OR (xa hoi)). hieu va chat xuc ban thanh vi ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ((x hoi) or (xa hoi)). hieu va chat xuc ban thanh vi ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((x hoi) or (xa hoi)). hieu va chat xuc ban thanh vi ((cua tre) OR (cuu tre))*.