Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
hanh manh » hanh mang, lanh manh, hoang manh
dung cong » dung trong
hoc hieu » hoc thieu, hoc hien, doc hieu
manh cua » doanh cua, ban cua
cua dung » cua dang, cua dong, qua dung
dan than » dan chan, ban than, van than

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 - hanh manh cua dung cong ((dan than) or (anh tuan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - hanh manh cua dung cong ((dan than) OR (anh tuan)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - hanh manh cua dung cong ((dan than) or (anh tuan)) cau*.