Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chiet tach » chieu sach
hieu lang » chieu sang, hieu quang, nhieu tang
hanh hanh » hanh han, xanh hanh, nhanh thanh
manh toan » thanh toan, anh tuan, tinh toan
vi nhung » voi nhung, vai nhung, va nhung
san toan » van toan, dan toan, xuan toan

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