Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
thuat mach » thuat sach, thuat tach, thuyet mach
hanh tranh » canh tranh, hanh trinh, hanh trang
trung cong » truong cong, trong cong, trung uong
tranh cua » doanh cua, manh cua
cua trung » cua truong, xuan trung, cua nhung
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than

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)) - hanh tranh cua trung cong ((dan toan) or (dan than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thiet tach) OR (thuat mach)) - hanh tranh cua trung cong ((dan toan) OR (dan than)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thiet tach) or (thuat mach)) - hanh tranh cua trung cong ((dan toan) or (dan than)) cau*.