Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, thien anh, thien danh
hieu manh » chieu xanh, hieu nganh, dieu hanh
hang hang » nang hang, cang thang, hung thang
dang cong » dung cong
hang van » hoang van, hang va, dang van
van dang » van dong, van dung, van nang
dan than » dan chan, van than, dan toan
ban than » ban thanh, van thanh, ban hang

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 ((thieu xanh) OR (hieu manh)) - hang hang van dang cong ((dan than) OR (ban than)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu xanh) OR (hieu manh)) - hang hang van dang cong ((dan than) or (ban than)) cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) OR (hieu manh)) - hang hang van dang cong ((dan than) or (ban than)) cau*.