Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chieu sang, chieu xanh
cong thanh » dong thanh, cong trinh, cong tan
trung cua » truong cua, trung tuan, trung cap
dung cong » dung trong
cua dung » cua dang, cua dong, qua dung
toan cao » toan tap
toan ban » van ban

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