Perhaps you should try some spelling variations:
thanh trung » thanh tung
chiet tach » chieu sach
trung tuan » trung thanh, trung tam, tran tuan
tuan nhung » quan nhung, tuan hung, thuat nhung
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan cau » toan cao, toan ban, toan tap

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: ho ((chiet tach) OR (hieu qua)) - thanh trung tuan nhung ((cong dan) OR (cong san)) toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chiet tach) or (hieu qua)) - thanh trung tuan nhung ((cong dan) OR (cong san)) toan cau~".
• Adding a wildcard symbol may retrieve word variants: ho ((chiet tach) or (hieu qua)) - thanh trung tuan nhung ((cong dan) OR (cong san)) toan cau*.