Perhaps you should try some spelling variations:
hanh trinh » hanh chinh
thuat mach » thuat sach, thuat tach, thuyet mach
nhung cong » dung cong, thong cong, hang cong
thuat tac » thuat tach, thuat tao, thuat tai
qua nhung » quan nhung, cua nhung, qua chung
cong van » cong vang, cong san, song van
van van » tan van, san van, van vat

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