Perhaps you should try some spelling variations:
hien manh » hien hanh, tien manh, hien nhanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
hang cong » dang cong, hang nong, bang cong
manh cua » doanh cua
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan ban » van ban
ban cua » ban quan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien manh) or (hieu manh)) - canh ((manh cua) OR (ban cua)) hang cong dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien manh) OR (hieu manh)) - canh ((manh cua) OR (ban cua)) hang cong dan toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien manh) or (hieu manh)) - canh ((manh cua) OR (ban cua)) hang cong dan toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien manh) or (hieu manh)) - canh ((manh cua) OR (ban cua)) hang cong dan toan ban*.