Perhaps you should try some spelling variations:
hanh trong » hanh trang, anh trong, hinh trong
chieu sach » chinh sach, chiet tach, chieu sang
hieu lang » chieu sang, hieu quang, nhieu tang
trong xay » thong xay, trong cac, trong ca
dung cong » dung trong
san toan » dan toan, manh toan, xuan toan
van toan » van tuan, van tan, van thanh

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