Perhaps you should try some spelling variations:
thanh trung » thanh tung
thieu sach » thien hach, hieu cach, theo sach
chieu sach » chinh sach, chiet tach, chieu sang
trung tao » trung tam, trong tao, trung tai
hang cong » dang cong, hang nong, bang cong
tao hang » tao zhang, tao khang, tao bang
dan toan » van toan, dan than, manh toan
ban than » ban thanh, van thanh, ban 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: hoc ((thieu sach) OR (chieu sach)) - thanh trung tao hang cong ((dan toan) OR (ban than)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu sach) OR (chieu sach)) - thanh trung tao hang cong ((dan toan) or (ban than)) cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu sach) OR (chieu sach)) - thanh trung tao hang cong ((dan toan) or (ban than)) cau*.