Perhaps you should try some spelling variations:
ban thanh » ban hang
thu sach » tu sach, thuat sach, thuoc sach
ban hanh » ban hang
phan cuu » phan cau, phan huu, phan cung
tu cach » tu cac
hieu va » lieu va, hieu qua
va giao » van giao, va giai, va gia
cuu tre » cua tre, cau tren, cau treo
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (thu sach)) ky nang x hoi. hieu va giao duc ((ban thanh) OR (ban hanh)) phan cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thu sach)) ky nang x hoi. hieu va giao duc ((ban thanh) OR (ban hanh)) phan cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (thu sach)) ky nang x hoi. hieu va giao duc ((ban thanh) OR (ban hanh)) phan cuu tre*".