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
cuc ban » cua ban, cac ban, cuu ban
va cham » va chat, va tham
va cam » va cac, va cao, va cai
do cua » doi cua, co cua, de cua
x hoi » xa hoi, o hoi, x ho
d cua » de cua, da cua, di 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 nang x hoi. hieu ((va cam) or (va cham)) cuc ban hanh ((d cua) OR (do cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu ((va cam) OR (va cham)) cuc ban hanh ((d cua) OR (do cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. hieu ((va cam) or (va cham)) cuc ban hanh ((d cua) OR (do cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu ((va cam) or (va cham)) cuc ban hanh ((d cua) OR (do cua)) tre*.