Perhaps you should try some spelling variations:
thiet tach » thien hach, thuat tach
chiet tach » chieu sach
hanh dang » hanh dong, anh dang, hanh dung
dang manh » dang hanh, dang minh, duong manh
manh hung » anh huong
hung cong » nhung cong, hung cuong, phung cong
manh toan » thanh toan, anh tuan, tinh toan
dan toan » van toan, dan than, xuan toan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: thep ((thiet tach) OR (chiet tach)) - hanh dang manh hung cong ((dan toan) OR (manh toan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thep ((thiet tach) OR (chiet tach)) - hanh dang manh hung cong ((dan toan) or (manh toan)) cau~".
• Adding a wildcard symbol may retrieve word variants: thep ((thiet tach) OR (chiet tach)) - hanh dang manh hung cong ((dan toan) or (manh toan)) cau*.