Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
thuat mach » thuat sach, thuat tach, thuyet mach
trinh luan » trinh luat, trinh quan, trinh han
thuat tac » thuat tach, thuat tao, thuat tai
luan hang » luan nang, luan han, luan hung
cong tran » cong tan, cong toan, cong tren
cong tuan » cong tan, cong luan, cong thanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((thuat mach) or (thuat tac)) - hanh trinh luan hang ((cong tran) OR (cong tuan)) van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((thuat mach) OR (thuat tac)) - hanh trinh luan hang ((cong tran) OR (cong tuan)) van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((thuat mach) or (thuat tac)) - hanh trinh luan hang ((cong tran) OR (cong tuan)) van ban".
• Adding a wildcard symbol may retrieve word variants: ho ((thuat mach) or (thuat tac)) - hanh trinh luan hang ((cong tran) OR (cong tuan)) van ban*.