Perhaps you should try some spelling variations:
hoc thieu » toc thieu, hoc hien
lanh bang » anh bang, lanh sang, can bang
hoi hieu » hoi phieu, hoi tieu, moi hieu
va thong » va thuong, va phuong, he thong
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
bang va » hang va, ban va, trang va

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) or (hoc thieu)) lang - lanh bang va thong ((cong dan) or (cong san)) van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoi hieu) OR (hoc thieu)) lang - lanh bang va thong ((cong dan) OR (cong san)) van ban.
• Adding a wildcard symbol may retrieve word variants: ((hoi hieu) or (hoc thieu)) lang - lanh bang va thong ((cong dan) or (cong san)) van ban*.