Perhaps you should try some spelling variations:
ban hang » ngan hang
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
dai hoi » dai hai, dai moi
va nang » van nang, da nang, cam nang
ban cua » ban quan
cua te » cua tu

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: so sach ty nang ((dai hoi) OR (dai hoc)). lieu va nang luc ((ban hanh) OR (ban hang)) ban cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty nang ((dai hoi) or (dai hoc)). lieu va nang luc ((ban hanh) OR (ban hang)) ban cua te~".
• Adding a wildcard symbol may retrieve word variants: so sach ty nang ((dai hoi) or (dai hoc)). lieu va nang luc ((ban hanh) OR (ban hang)) ban cua te*.