Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sach » chieu sach, thien hach, theo sach
thong cong » trong cong, tong cong, thong thong
hieu cach » hieu cac, chieu sach, hieu ca
trung vap » trung cap, trung va, trung van
vap thong » va thong, van thong, phap thong
ban hangh » ban hanh, ban thanh, van hanh
ban hang » ngan hang

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: toc ((thieu sach) OR (hieu cach)) - thanh trung vap thong cong ((ban hang) OR (ban hangh)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((thieu sach) OR (hieu cach)) - thanh trung vap thong cong ((ban hang) or (ban hangh)) cau~".
• Adding a wildcard symbol may retrieve word variants: toc ((thieu sach) OR (hieu cach)) - thanh trung vap thong cong ((ban hang) or (ban hangh)) cau*.