Perhaps you should try some spelling variations:
khang cong » hang cong, thanh cong, dang cong
hieu lang » chieu sang, hieu quang, nhieu tang
chinh van » chinh va, chinh ban, chinh can
van khang » van khanh, van thanh, van quang
manh toan » thanh toan, anh tuan, tinh toan
hoi hieu » hoi phieu, hoi tieu, moi hieu
dan than » dan chan, ban than, van than

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoi hieu lang - hanh chinh van khang cong ((dan than) or (manh toan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi hieu lang - hanh chinh van khang cong ((dan than) OR (manh toan)) tap.
• Adding a wildcard symbol may retrieve word variants: hoi hieu lang - hanh chinh van khang cong ((dan than) or (manh toan)) tap*.