Perhaps you should try some spelling variations:
ban hang » ngan hang
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
nang o » nang co, nang ho, nang ro
va cua » va chua, via cua, ca cua
o hoi » co hoi, o hoc, o hai

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang o hoi. hieu va ((nhan luc) OR (nang luc)) ban hang va cua viet~.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang o hoi. hieu va ((nhan luc) or (nang luc)) ban hang va cua viet*.