Perhaps you should try some spelling variations:
thanh trung » thanh tung
chiet tach » chieu sach
khong cong » thong cong, khong cang, khong con
chong cong » cong cong, thong cong, cuong cong
trung cua » truong cua, trung tuan, trung cap
tac than » tac thanh, tam than, tac nhan
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chiet tach) or (chinh sach)) - thanh trung cua ((khong cong) OR (chong cong)) tac than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chiet tach) OR (chinh sach)) - thanh trung cua ((khong cong) OR (chong cong)) tac than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chiet tach) or (chinh sach)) - thanh trung cua ((khong cong) OR (chong cong)) tac than cau".
• Adding a wildcard symbol may retrieve word variants: ho ((chiet tach) or (chinh sach)) - thanh trung cua ((khong cong) OR (chong cong)) tac than cau*.