Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
ban hang » ngan hang
ky dang » ky nang
ky danh » ky anh
hieu ve » hieu va, hieu van
cac thu » cach thuc, cac thoi
thu ban » thu hang
hai van » thai van, ha van, hai tan
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((ky dang) or (ky danh)) xa hoi. hieu ve cac thu ban hang ((hai van) or (hoi va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ky dang) OR (ky danh)) xa hoi. hieu ve cac thu ban hang ((hai van) OR (hoi va)) triet.
• Adding a wildcard symbol may retrieve word variants: thu sach ((ky dang) or (ky danh)) xa hoi. hieu ve cac thu ban hang ((hai van) or (hoi va)) triet*.