Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
thuat mach » thuat sach, thuat tach, thuyet mach
quan nhung » qua nhung, luan chung, quang hung
thuat tac » thuat tach, thuat tao, thuat tai
cua nhung » va nhung
cong san » cong tac
san van » tan van, luan van, tran van

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 ((quan nhung) OR (cua nhung)) cong san van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((thuat mach) OR (thuat tac)) - hanh trinh ((quan nhung) OR (cua nhung)) cong san van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((thuat mach) or (thuat tac)) - hanh trinh ((quan nhung) OR (cua nhung)) cong san van ban".
• Adding a wildcard symbol may retrieve word variants: ho ((thuat mach) or (thuat tac)) - hanh trinh ((quan nhung) OR (cua nhung)) cong san van ban*.