Perhaps you should try some spelling variations:
ban hang » ngan hang
thuc ban » thuoc ban, thuc dan, thu ban
nam thuc » nam thuoc, am thuc, nam thu
bo sach » co sach, hoc sach
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
ve nam » he nam, va nam, le nam
ma hoi » xa hoi, ma hoa, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach ky nang ((ma hoi) or (mai hoi)). hieu ve nam thuc ban hang ((hoi cua) OR (hoi chuc)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ky nang ((ma hoi) OR (mai hoi)). hieu ve nam thuc ban hang ((hoi cua) OR (hoi chuc)) triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach ky nang ((ma hoi) or (mai hoi)). hieu ve nam thuc ban hang ((hoi cua) OR (hoi chuc)) triet*".