Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
sang thanh » dang thanh, sang than, tang thanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
hien hanh » dieu hanh
chinh cua » chinh ca, chinh sua, hinh cua
cua nhung » va nhung
cong sang » cong san, cong lang, cong vang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu manh) or (hien hanh)) - hanh chinh cua nhung cong sang thanh san~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (hien hanh)) - hanh chinh cua nhung cong sang thanh san.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (hien hanh)) - hanh chinh cua nhung cong sang thanh san*.