Perhaps you should try some spelling variations:
khong cong » thong cong, khong cang, chong cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
cua khong » hua khong, cua phuong, cua thuong
doc hieu » toc thieu, hoc thieu, hoc hien
lanh ban » lanh bang, lang ban, doanh ban
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, dang thanh
van than » van thanh, van thang, van tuan
ban cua » ban quan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu manh - lanh ban cua khong cong ((dan toan) OR (((dan than) OR (van than)))) cao~.
• Adding a wildcard symbol may retrieve word variants: doc hieu manh - lanh ban cua khong cong ((dan toan) or (((dan than) or (van than)))) cao*.