Perhaps you should try some spelling variations:
chiet tach » chieu sach
hieu lang » chieu sang, hieu quang, nhieu tang
xanh hanh » danh thanh, ban hanh, van hanh
dung cong » dung trong
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan ban » van ban
vi dung » va dung, vi ung, vi dong

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((hieu lang) OR (chiet tach)) - xanh hanh vi dung cong san toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu lang) OR (chiet tach)) - xanh hanh vi dung cong san toan ban".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu lang) OR (chiet tach)) - xanh hanh vi dung cong san toan ban*.