Perhaps you should try some spelling variations:
hanh trinh » canh tranh
thuat mach » thuat sach, thuat tach, thuyet mach
quan thong » quang thong, quan trong, xuan thong
thong cong » trong cong, tong cong, thong thong
thuat tac » thuat tach, thuat tao, thuat tai
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 (hanh chinh)) quan thong 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 (hanh chinh)) quan thong 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 (hanh chinh)) quan thong cong van van ban".
• Adding a wildcard symbol may retrieve word variants: ho ((thuat mach) or (thuat tac)) - ((hanh trinh) OR (hanh chinh)) quan thong cong van van ban*.