Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
hang hang » nang hang, cang thang, hung thang
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
tnhan tai » toan tai, nhan tao, han tai
hoc hieu » hoc thieu, hoc hien, doc hieu
nhan tai » hang tai, van tai, toan tai

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 - hang hang va ((hang cong) or (dang cong)) van ((tnhan tai) or (nhan tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - hang hang va ((hang cong) OR (dang cong)) van ((tnhan tai) OR (nhan tai)).
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - hang hang va ((hang cong) or (dang cong)) van ((tnhan tai) or (nhan tai))*.