Perhaps you should try some spelling variations:
chiet tach » chieu sach
thanh tung » thanh cong
hieu lang » chieu sang, hieu quang, nhieu tang
dung cong » dung trong
van dung » van dong, xay dung, tin dung
cong dan » cong san, cong tan, huong dan
ca cau » cua cau, cac cau, can cau

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 (hieu lang)) - ((thanh trung) OR (thanh tung)) van dung cong dan ca cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chiet tach) OR (hieu lang)) - ((thanh trung) OR (thanh tung)) van dung cong dan ca cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chiet tach) or (hieu lang)) - ((thanh trung) OR (thanh tung)) van dung cong dan ca cau*".