Perhaps you should try some spelling variations:
thanh chung » thanh chuong, thanh hung, thanh phuong
chieu sach » chinh sach, chieu sang, chieu xanh
duong cong » dung cong, luong cong, duong trong
chung cua » chung cu, dung cua, huong cua
dong cong » dung cong, dang cong, cong cong
van nang » van quang, van ban, van dong
nang ca » nang cao, nang cap, nang cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sach) or (chiet tach)) - thanh chung cua ((dong cong) OR (duong cong)) van nang ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chiet tach)) - thanh chung cua ((dong cong) OR (duong cong)) van nang ca.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sach) or (chiet tach)) - thanh chung cua ((dong cong) OR (duong cong)) van nang ca".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chiet tach)) - thanh chung cua ((dong cong) OR (duong cong)) van nang ca*.