Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
hanh tang » hanh trang, hanh mang, hanh tung
cua nhung » va nhung
hoc hieu » hoc thieu, hoc hien, doc hieu
anh tang » anh bang, anh dang, anh nang
dan than » dan chan, ban than, van than

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: hoc hieu manh - ((hanh tang) OR (anh tang)) cua nhung cong ((xuan toan) OR (dan than)) ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - ((hanh tang) OR (anh tang)) cua nhung cong ((xuan toan) or (dan than)) ban~".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - ((hanh tang) OR (anh tang)) cua nhung cong ((xuan toan) or (dan than)) ban*.