Perhaps you should try some spelling variations:
ban hang » ngan hang
tu sach » thu sach, su sach, te sach
tai cua » thai cua, tai cuc, tri cua
ban han » ban hanh, ban than, ban nhan
cua duc » cua tuc, cua nuoc, cua quoc
nang ma » tang ma, sang ma, nang cao
sach v » sach va, sach y, sach 2
va dau » va dao
va cau » van cau, va cac, va cao
ma hoi » mai hoi, xa hoi, ma hoa
v nang » va nang, vu nang, van nang

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 v nang ma hoi. hieu ((va cau) OR (va dau)) luc ((ban han) OR (ban hang)) tai cua duc~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach v nang ma hoi. hieu ((va cau) or (va dau)) luc ((ban han) OR (ban hang)) tai cua duc~".
• Adding a wildcard symbol may retrieve word variants: tu sach v nang ma hoi. hieu ((va cau) or (va dau)) luc ((ban han) OR (ban hang)) tai cua duc*.