Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
thuat mach » thuat sach, thuat tach, thuyet mach
quan thong » quang thong, xuan thong, quang thang
quan trong » gian trong
thuat tac » thuat tach, thuat tao, thuat tai
thong tan » thong than, thong tran, thong tin
tan van » tran van, tang van, luan 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 thong) OR (quan trong)) thong tan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((thuat mach) OR (thuat tac)) - hanh trinh ((quan thong) OR (quan trong)) thong tan van ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((thuat mach) or (thuat tac)) - hanh trinh ((quan thong) OR (quan trong)) thong tan van ban".
• Adding a wildcard symbol may retrieve word variants: ho ((thuat mach) or (thuat tac)) - hanh trinh ((quan thong) OR (quan trong)) thong tan van ban*.