Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sach » chieu sach, thien hach, hieu cach
thong cong » tong cong, thong thong, phong chong
hien hanh » dieu hanh
trung cua » truong cua, trung tuan, trung cap
dan than » dan chan, ban than, van than
than cap » khan cap, thanh lap, thanh cac

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 (hien hanh)) - thanh trung cua ((thong cong) OR (trong cong)) dan than cap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((thieu sach) or (hien hanh)) - thanh trung cua ((thong cong) OR (trong cong)) dan than cap~".
• Adding a wildcard symbol may retrieve word variants: toc ((thieu sach) or (hien hanh)) - thanh trung cua ((thong cong) OR (trong cong)) dan than cap*.