Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
hieu lang » chieu sang, hieu quang, nhieu tang
manh hung » anh huong
bang cong » dang cong, bang song, hang cong
hung cua » huong cua, chung cua, khung cua
cua bang » chua bang, cua ban, cua dang
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cao » toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((hieu manh) or (hieu lang)) - manh hung cua bang cong san toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((hieu manh) OR (hieu lang)) - manh hung cua bang cong san toan cao.
• Adding a wildcard symbol may retrieve word variants: theo ((hieu manh) or (hieu lang)) - manh hung cua bang cong san toan cao*.