Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
bang cong » dang cong, bang song, hang cong
hoc hieu » hoc thieu, hoc hien, doc hieu
trang va » tran van
cong dan » cong san, cong tan, huong 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 cong dan than cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - thanh ((trang va) OR (hang va)) bang cong dan than cao".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - thanh ((trang va) OR (hang va)) bang cong dan than cao*.