Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
bang song » nang song
hoc hieu » hoc thieu, hoc hien, doc hieu
trang va » tran van
song dan » song danh, song van, cong dan
dan than » dan chan, ban than, van than
than cao » toan cao, thai cao, than cap

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 - thanh ((trang va) or (hang va)) bang song dan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - thanh ((trang va) OR (hang va)) bang song dan than cao.
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - thanh ((trang va) or (hang va)) bang song dan than cao*.