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