Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
so sach » so sanh, bo sach, co sach
san cuu » san cua, san huu, song cuu
tuc ban » thuc ban, truc ban, tu ban
va chat » van chat, va phat, cao chat
ve chat » van chat
ty nang » ky nang, ty hang, ly nang
cuu tre » cua tre, cau tren, cau treo
co hoi » co hoc, co loi

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((ty nang) or (ty xang)) co hoi. hieu ((ve chat) OR (va chat)) tuc ban thanh san cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ty nang) OR (ty xang)) co hoi. hieu ((ve chat) OR (va chat)) tuc ban thanh san cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((ty nang) or (ty xang)) co hoi. hieu ((ve chat) OR (va chat)) tuc ban thanh san cuu tre".
• Adding a wildcard symbol may retrieve word variants: so sach ((ty nang) or (ty xang)) co hoi. hieu ((ve chat) OR (va chat)) tuc ban thanh san cuu tre*.