Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chieu sang, chieu xanh
trung tuan » trung thanh, trung tam, tran tuan
chung nhan » chung khoan, dung nhan, chung nam
tuan dung » tuan duong, tran dung, tan dung
chung dan » chung han, hung dan, chung luan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sach) OR (chiet tach)) - thanh trung tuan dung ((chung dan) or (chung nhan)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (chiet tach)) - thanh trung tuan dung ((chung dan) OR (chung nhan)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sach) OR (chiet tach)) - thanh trung tuan dung ((chung dan) or (chung nhan)) toan cao".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) OR (chiet tach)) - thanh trung tuan dung ((chung dan) or (chung nhan)) toan cao*.