Perhaps you should try some spelling variations:
truc ban » thuc ban, truc dan, truc van
ban hanh » ban hang
hanh hoi » hanh thoi, hanh noi, hanh hoa
so sach » so sanh, bo sach, co sach
ty nang » ky nang, ty hang, ly nang
hoi cua » hoi chuc
cua tre » cua te, cuu tre, cua triet
va cau » van cau, va cac, va dau

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)) xa hoi. lieu va cau truc ban hanh hoi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ty nang) OR (ty xang)) xa hoi. lieu va cau truc ban hanh hoi cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ((ty nang) or (ty xang)) xa hoi. lieu va cau truc ban hanh hoi cua tre*.