Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
dang xay » dang van, van xay
cham duc » pham duc, cham soc, pham duy
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
hieu va » lieu va, hieu qua
va cham » va chat, va tham
duc ban » duc tan, duc van, dua ban
va cua » va chua, via cua, ma cua
ca cua » co cua

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 dang xay hoi. hieu va cham duc ban thanh ((va cua) or (ca cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xay hoi. hieu va cham duc ban thanh ((va cua) OR (ca cua)) viet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xay hoi. hieu va cham duc ban thanh ((va cua) or (ca cua)) viet*.