Perhaps you should try some spelling variations:
ban hang » ngan hang
hang vai » hang va, hang tai, hang hai
su sach » vu sach
so sach » so sanh, bo sach, co sach
ty nang » ty xang, ty hang, ly nang
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
duc ban » duc tan, duc van, dua ban
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet

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

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