Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
hang hang » nang hang, cang thang, hung thang
hoc hieu » hoc thieu, hoc hien, doc hieu
van dang » van dong, van dung, van dan
van nang » van quang, van ban, van dong
dan chan » dan gian, dan ca, van chat
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 hieu manh - hang hang ((van dang) OR (van nang)) cong ((dan chan) OR (ban than)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - hang hang ((van dang) OR (van nang)) cong ((dan chan) or (ban than)) cau~".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - hang hang ((van dang) OR (van nang)) cong ((dan chan) or (ban than)) cau*.