Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
thuat mach » thuat sach, thuat tach, thuyet mach
cua dong » chua dong, cua cong, cua nong
cua dang » cua cong, cua ban
cong van » cong vang, cong san, song van
van toan » van tuan, van tan, van thanh
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thiet tach) or (thuat mach)) - canh tranh ((cua dong) OR (cua dang)) cong van toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thiet tach) OR (thuat mach)) - canh tranh ((cua dong) OR (cua dang)) cong van toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thiet tach) or (thuat mach)) - canh tranh ((cua dong) OR (cua dang)) cong van toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thiet tach) or (thuat mach)) - canh tranh ((cua dong) OR (cua dang)) cong van toan cau*.