Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chinh vai » chinh tai, chinh va, chinh vi
vai nhung » va nhung, voi nhung, vap nhung
cong vang » cong lang, cong quang, cong ngang
vang phan » van phan, nang phan, quang phan
hoi hieu » hoi phieu, hoi tieu, moi hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo tieu) or (hoi hieu)) lang - hanh chinh vai nhung cong vang phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo tieu) OR (hoi hieu)) lang - hanh chinh vai nhung cong vang phan tu.
• Adding a wildcard symbol may retrieve word variants: ((theo tieu) or (hoi hieu)) lang - hanh chinh vai nhung cong vang phan tu*.