Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chiet tach, chieu sang
hieu xanh » chieu xanh, hieu manh, hieu nganh
trung van » truong van, trong van, trung va
dung cong » dung trong
van dung » van dong, xay dung, tin dung
dan toan » van toan, dan than, manh toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu xanh) or (chieu sach)) - thanh trung van dung cong ((dan toan) or (tan tran)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (chieu sach)) - thanh trung van dung cong ((dan toan) OR (tan tran)) cau.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) or (chieu sach)) - thanh trung van dung cong ((dan toan) or (tan tran)) cau*.