Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
dung cong » dung trong
chinh ta » chinh tai, chinh va, chinh tri
dan than » dan chan, ban than, van than
van toan » van tuan, van tan, van thanh
ho hieu » ho chieu, hoi hieu, nho hieu
ta dung » tac dung, tan dung, tao dung

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 - hanh chinh ta dung cong ((dan than) or (van toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - hanh chinh ta dung cong ((dan than) OR (van toan)) cau.
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh chinh ta dung cong ((dan than) or (van toan)) cau*.