Perhaps you should try some spelling variations:
thiet tach » thien hach, thuat tach
chiet tach » chieu sach
hanh doanh » hang doanh, chinh doanh, doanh doanh
doanh cua » doanh luan
cua nhung » va nhung
cong van » cong vang, song van, cong tan
cong san » cong tac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thiet tach) or (chiet tach)) - hanh doanh cua nhung ((cong van) OR (cong san)) van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thiet tach) OR (chiet tach)) - hanh doanh cua nhung ((cong van) OR (cong san)) van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thiet tach) or (chiet tach)) - hanh doanh cua nhung ((cong van) OR (cong san)) van ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((thiet tach) or (chiet tach)) - hanh doanh cua nhung ((cong van) OR (cong san)) van ban*.